Vendor github.com/stretchr/testify for the assert package

8 years ago · a5d0b4de5b
parent 70fb1cf9d1
commit a5d0b4de5b
20 changed files with 4533 additions and 0 deletions
--- a/vendor/github.com/davecgh/go-spew/LICENSE
+++ b/vendor/github.com/davecgh/go-spew/LICENSE
@ -0,0 +1,15 @@
 ISC License
 Copyright (c) 2012-2013 Dave Collins <dave@davec.name>
 Permission to use, copy, modify, and distribute this software for any
 purpose with or without fee is hereby granted, provided that the above
 copyright notice and this permission notice appear in all copies.
 THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
--- a/vendor/github.com/davecgh/go-spew/spew/bypass.go
+++ b/vendor/github.com/davecgh/go-spew/spew/bypass.go
@ -0,0 +1,152 @@
 // Copyright (c) 2015 Dave Collins <dave@davec.name>
 //
 // Permission to use, copy, modify, and distribute this software for any
 // purpose with or without fee is hereby granted, provided that the above
 // copyright notice and this permission notice appear in all copies.
 //
 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 // NOTE: Due to the following build constraints, this file will only be compiled
 // when the code is not running on Google App Engine, compiled by GopherJS, and
 // "-tags safe" is not added to the go build command line.  The "disableunsafe"
 // tag is deprecated and thus should not be used.
 // +build !js,!appengine,!safe,!disableunsafe
 package spew
 import (
 	"reflect"
 	"unsafe"
 )
 const (
 	// UnsafeDisabled is a build-time constant which specifies whether or
 	// not access to the unsafe package is available.
 	UnsafeDisabled = false
 	// ptrSize is the size of a pointer on the current arch.
 	ptrSize = unsafe.Sizeof((*byte)(nil))
 )
 var (
 	// offsetPtr, offsetScalar, and offsetFlag are the offsets for the
 	// internal reflect.Value fields.  These values are valid before golang
 	// commit ecccf07e7f9d which changed the format.  The are also valid
 	// after commit 82f48826c6c7 which changed the format again to mirror
 	// the original format.  Code in the init function updates these offsets
 	// as necessary.
 	offsetPtr    = uintptr(ptrSize)
 	offsetScalar = uintptr(0)
 	offsetFlag   = uintptr(ptrSize * 2)
 	// flagKindWidth and flagKindShift indicate various bits that the
 	// reflect package uses internally to track kind information.
 	//
 	// flagRO indicates whether or not the value field of a reflect.Value is
 	// read-only.
 	//
 	// flagIndir indicates whether the value field of a reflect.Value is
 	// the actual data or a pointer to the data.
 	//
 	// These values are valid before golang commit 90a7c3c86944 which
 	// changed their positions.  Code in the init function updates these
 	// flags as necessary.
 	flagKindWidth = uintptr(5)
 	flagKindShift = uintptr(flagKindWidth - 1)
 	flagRO        = uintptr(1 << 0)
 	flagIndir     = uintptr(1 << 1)
 )
 func init() {
 	// Older versions of reflect.Value stored small integers directly in the
 	// ptr field (which is named val in the older versions).  Versions
 	// between commits ecccf07e7f9d and 82f48826c6c7 added a new field named
 	// scalar for this purpose which unfortunately came before the flag
 	// field, so the offset of the flag field is different for those
 	// versions.
 	//
 	// This code constructs a new reflect.Value from a known small integer
 	// and checks if the size of the reflect.Value struct indicates it has
 	// the scalar field. When it does, the offsets are updated accordingly.
 	vv := reflect.ValueOf(0xf00)
 	if unsafe.Sizeof(vv) == (ptrSize * 4) {
 		offsetScalar = ptrSize * 2
 		offsetFlag = ptrSize * 3
 	}
 	// Commit 90a7c3c86944 changed the flag positions such that the low
 	// order bits are the kind.  This code extracts the kind from the flags
 	// field and ensures it's the correct type.  When it's not, the flag
 	// order has been changed to the newer format, so the flags are updated
 	// accordingly.
 	upf := unsafe.Pointer(uintptr(unsafe.Pointer(&vv)) + offsetFlag)
 	upfv := *(*uintptr)(upf)
 	flagKindMask := uintptr((1<<flagKindWidth - 1) << flagKindShift)
 	if (upfv&flagKindMask)>>flagKindShift != uintptr(reflect.Int) {
 		flagKindShift = 0
 		flagRO = 1 << 5
 		flagIndir = 1 << 6
 		// Commit adf9b30e5594 modified the flags to separate the
 		// flagRO flag into two bits which specifies whether or not the
 		// field is embedded.  This causes flagIndir to move over a bit
 		// and means that flagRO is the combination of either of the
 		// original flagRO bit and the new bit.
 		//
 		// This code detects the change by extracting what used to be
 		// the indirect bit to ensure it's set.  When it's not, the flag
 		// order has been changed to the newer format, so the flags are
 		// updated accordingly.
 		if upfv&flagIndir == 0 {
 			flagRO = 3 << 5
 			flagIndir = 1 << 7
 		}
 	}
 }
 // unsafeReflectValue converts the passed reflect.Value into a one that bypasses
 // the typical safety restrictions preventing access to unaddressable and
 // unexported data.  It works by digging the raw pointer to the underlying
 // value out of the protected value and generating a new unprotected (unsafe)
 // reflect.Value to it.
 //
 // This allows us to check for implementations of the Stringer and error
 // interfaces to be used for pretty printing ordinarily unaddressable and
 // inaccessible values such as unexported struct fields.
 func unsafeReflectValue(v reflect.Value) (rv reflect.Value) {
 	indirects := 1
 	vt := v.Type()
 	upv := unsafe.Pointer(uintptr(unsafe.Pointer(&v)) + offsetPtr)
 	rvf := *(*uintptr)(unsafe.Pointer(uintptr(unsafe.Pointer(&v)) + offsetFlag))
 	if rvf&flagIndir != 0 {
 		vt = reflect.PtrTo(v.Type())
 		indirects++
 	} else if offsetScalar != 0 {
 		// The value is in the scalar field when it's not one of the
 		// reference types.
 		switch vt.Kind() {
 		case reflect.Uintptr:
 		case reflect.Chan:
 		case reflect.Func:
 		case reflect.Map:
 		case reflect.Ptr:
 		case reflect.UnsafePointer:
 		default:
 			upv = unsafe.Pointer(uintptr(unsafe.Pointer(&v)) +
 				offsetScalar)
 		}
 	}
 	pv := reflect.NewAt(vt, upv)
 	rv = pv
 	for i := 0; i < indirects; i++ {
 		rv = rv.Elem()
 	}
 	return rv
 }
--- a/vendor/github.com/davecgh/go-spew/spew/bypasssafe.go
+++ b/vendor/github.com/davecgh/go-spew/spew/bypasssafe.go
@ -0,0 +1,38 @@
 // Copyright (c) 2015 Dave Collins <dave@davec.name>
 //
 // Permission to use, copy, modify, and distribute this software for any
 // purpose with or without fee is hereby granted, provided that the above
 // copyright notice and this permission notice appear in all copies.
 //
 // THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 // WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 // MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 // ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 // WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 // ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 // OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 // NOTE: Due to the following build constraints, this file will only be compiled
 // when the code is running on Google App Engine, compiled by GopherJS, or
 // "-tags safe" is added to the go build command line.  The "disableunsafe"
 // tag is deprecated and thus should not be used.
 // +build js appengine safe disableunsafe
 package spew
 import "reflect"
 const (
 	// UnsafeDisabled is a build-time constant which specifies whether or
 	// not access to the unsafe package is available.
 	UnsafeDisabled = true
 )
 // unsafeReflectValue typically converts the passed reflect.Value into a one
 // that bypasses the typical safety restrictions preventing access to
 // unaddressable and unexported data.  However, doing this relies on access to
 // the unsafe package.  This is a stub version which simply returns the passed
 // reflect.Value when the unsafe package is not available.
 func unsafeReflectValue(v reflect.Value) reflect.Value {
 	return v
 }
--- a/vendor/github.com/davecgh/go-spew/spew/common.go
+++ b/vendor/github.com/davecgh/go-spew/spew/common.go
@ -0,0 +1,341 @@
 /*
 * Copyright (c) 2013 Dave Collins <dave@davec.name>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 package spew
 import (
 	"bytes"
 	"fmt"
 	"io"
 	"reflect"
 	"sort"
 	"strconv"
 )
 // Some constants in the form of bytes to avoid string overhead.  This mirrors
 // the technique used in the fmt package.
 var (
 	panicBytes            = []byte("(PANIC=")
 	plusBytes             = []byte("+")
 	iBytes                = []byte("i")
 	trueBytes             = []byte("true")
 	falseBytes            = []byte("false")
 	interfaceBytes        = []byte("(interface {})")
 	commaNewlineBytes     = []byte(",\n")
 	newlineBytes          = []byte("\n")
 	openBraceBytes        = []byte("{")
 	openBraceNewlineBytes = []byte("{\n")
 	closeBraceBytes       = []byte("}")
 	asteriskBytes         = []byte("*")
 	colonBytes            = []byte(":")
 	colonSpaceBytes       = []byte(": ")
 	openParenBytes        = []byte("(")
 	closeParenBytes       = []byte(")")
 	spaceBytes            = []byte(" ")
 	pointerChainBytes     = []byte("->")
 	nilAngleBytes         = []byte("<nil>")
 	maxNewlineBytes       = []byte("<max depth reached>\n")
 	maxShortBytes         = []byte("<max>")
 	circularBytes         = []byte("<already shown>")
 	circularShortBytes    = []byte("<shown>")
 	invalidAngleBytes     = []byte("<invalid>")
 	openBracketBytes      = []byte("[")
 	closeBracketBytes     = []byte("]")
 	percentBytes          = []byte("%")
 	precisionBytes        = []byte(".")
 	openAngleBytes        = []byte("<")
 	closeAngleBytes       = []byte(">")
 	openMapBytes          = []byte("map[")
 	closeMapBytes         = []byte("]")
 	lenEqualsBytes        = []byte("len=")
 	capEqualsBytes        = []byte("cap=")
 )
 // hexDigits is used to map a decimal value to a hex digit.
 var hexDigits = "0123456789abcdef"
 // catchPanic handles any panics that might occur during the handleMethods
 // calls.
 func catchPanic(w io.Writer, v reflect.Value) {
 	if err := recover(); err != nil {
 		w.Write(panicBytes)
 		fmt.Fprintf(w, "%v", err)
 		w.Write(closeParenBytes)
 	}
 }
 // handleMethods attempts to call the Error and String methods on the underlying
 // type the passed reflect.Value represents and outputes the result to Writer w.
 //
 // It handles panics in any called methods by catching and displaying the error
 // as the formatted value.
 func handleMethods(cs *ConfigState, w io.Writer, v reflect.Value) (handled bool) {
 	// We need an interface to check if the type implements the error or
 	// Stringer interface.  However, the reflect package won't give us an
 	// interface on certain things like unexported struct fields in order
 	// to enforce visibility rules.  We use unsafe, when it's available,
 	// to bypass these restrictions since this package does not mutate the
 	// values.
 	if !v.CanInterface() {
 		if UnsafeDisabled {
 			return false
 		}
 		v = unsafeReflectValue(v)
 	}
 	// Choose whether or not to do error and Stringer interface lookups against
 	// the base type or a pointer to the base type depending on settings.
 	// Technically calling one of these methods with a pointer receiver can
 	// mutate the value, however, types which choose to satisify an error or
 	// Stringer interface with a pointer receiver should not be mutating their
 	// state inside these interface methods.
 	if !cs.DisablePointerMethods && !UnsafeDisabled && !v.CanAddr() {
 		v = unsafeReflectValue(v)
 	}
 	if v.CanAddr() {
 		v = v.Addr()
 	}
 	// Is it an error or Stringer?
 	switch iface := v.Interface().(type) {
 	case error:
 		defer catchPanic(w, v)
 		if cs.ContinueOnMethod {
 			w.Write(openParenBytes)
 			w.Write([]byte(iface.Error()))
 			w.Write(closeParenBytes)
 			w.Write(spaceBytes)
 			return false
 		}
 		w.Write([]byte(iface.Error()))
 		return true
 	case fmt.Stringer:
 		defer catchPanic(w, v)
 		if cs.ContinueOnMethod {
 			w.Write(openParenBytes)
 			w.Write([]byte(iface.String()))
 			w.Write(closeParenBytes)
 			w.Write(spaceBytes)
 			return false
 		}
 		w.Write([]byte(iface.String()))
 		return true
 	}
 	return false
 }
 // printBool outputs a boolean value as true or false to Writer w.
 func printBool(w io.Writer, val bool) {
 	if val {
 		w.Write(trueBytes)
 	} else {
 		w.Write(falseBytes)
 	}
 }
 // printInt outputs a signed integer value to Writer w.
 func printInt(w io.Writer, val int64, base int) {
 	w.Write([]byte(strconv.FormatInt(val, base)))
 }
 // printUint outputs an unsigned integer value to Writer w.
 func printUint(w io.Writer, val uint64, base int) {
 	w.Write([]byte(strconv.FormatUint(val, base)))
 }
 // printFloat outputs a floating point value using the specified precision,
 // which is expected to be 32 or 64bit, to Writer w.
 func printFloat(w io.Writer, val float64, precision int) {
 	w.Write([]byte(strconv.FormatFloat(val, 'g', -1, precision)))
 }
 // printComplex outputs a complex value using the specified float precision
 // for the real and imaginary parts to Writer w.
 func printComplex(w io.Writer, c complex128, floatPrecision int) {
 	r := real(c)
 	w.Write(openParenBytes)
 	w.Write([]byte(strconv.FormatFloat(r, 'g', -1, floatPrecision)))
 	i := imag(c)
 	if i >= 0 {
 		w.Write(plusBytes)
 	}
 	w.Write([]byte(strconv.FormatFloat(i, 'g', -1, floatPrecision)))
 	w.Write(iBytes)
 	w.Write(closeParenBytes)
 }
 // printHexPtr outputs a uintptr formatted as hexidecimal with a leading '0x'
 // prefix to Writer w.
 func printHexPtr(w io.Writer, p uintptr) {
 	// Null pointer.
 	num := uint64(p)
 	if num == 0 {
 		w.Write(nilAngleBytes)
 		return
 	}
 	// Max uint64 is 16 bytes in hex + 2 bytes for '0x' prefix
 	buf := make([]byte, 18)
 	// It's simpler to construct the hex string right to left.
 	base := uint64(16)
 	i := len(buf) - 1
 	for num >= base {
 		buf[i] = hexDigits[num%base]
 		num /= base
 		i--
 	}
 	buf[i] = hexDigits[num]
 	// Add '0x' prefix.
 	i--
 	buf[i] = 'x'
 	i--
 	buf[i] = '0'
 	// Strip unused leading bytes.
 	buf = buf[i:]
 	w.Write(buf)
 }
 // valuesSorter implements sort.Interface to allow a slice of reflect.Value
 // elements to be sorted.
 type valuesSorter struct {
 	values  []reflect.Value
 	strings []string // either nil or same len and values
 	cs      *ConfigState
 }
 // newValuesSorter initializes a valuesSorter instance, which holds a set of
 // surrogate keys on which the data should be sorted.  It uses flags in
 // ConfigState to decide if and how to populate those surrogate keys.
 func newValuesSorter(values []reflect.Value, cs *ConfigState) sort.Interface {
 	vs := &valuesSorter{values: values, cs: cs}
 	if canSortSimply(vs.values[0].Kind()) {
 		return vs
 	}
 	if !cs.DisableMethods {
 		vs.strings = make([]string, len(values))
 		for i := range vs.values {
 			b := bytes.Buffer{}
 			if !handleMethods(cs, &b, vs.values[i]) {
 				vs.strings = nil
 				break
 			}
 			vs.strings[i] = b.String()
 		}
 	}
 	if vs.strings == nil && cs.SpewKeys {
 		vs.strings = make([]string, len(values))
 		for i := range vs.values {
 			vs.strings[i] = Sprintf("%#v", vs.values[i].Interface())
 		}
 	}
 	return vs
 }
 // canSortSimply tests whether a reflect.Kind is a primitive that can be sorted
 // directly, or whether it should be considered for sorting by surrogate keys
 // (if the ConfigState allows it).
 func canSortSimply(kind reflect.Kind) bool {
 	// This switch parallels valueSortLess, except for the default case.
 	switch kind {
 	case reflect.Bool:
 		return true
 	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
 		return true
 	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
 		return true
 	case reflect.Float32, reflect.Float64:
 		return true
 	case reflect.String:
 		return true
 	case reflect.Uintptr:
 		return true
 	case reflect.Array:
 		return true
 	}
 	return false
 }
 // Len returns the number of values in the slice.  It is part of the
 // sort.Interface implementation.
 func (s *valuesSorter) Len() int {
 	return len(s.values)
 }
 // Swap swaps the values at the passed indices.  It is part of the
 // sort.Interface implementation.
 func (s *valuesSorter) Swap(i, j int) {
 	s.values[i], s.values[j] = s.values[j], s.values[i]
 	if s.strings != nil {
 		s.strings[i], s.strings[j] = s.strings[j], s.strings[i]
 	}
 }
 // valueSortLess returns whether the first value should sort before the second
 // value.  It is used by valueSorter.Less as part of the sort.Interface
 // implementation.
 func valueSortLess(a, b reflect.Value) bool {
 	switch a.Kind() {
 	case reflect.Bool:
 		return !a.Bool() && b.Bool()
 	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
 		return a.Int() < b.Int()
 	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
 		return a.Uint() < b.Uint()
 	case reflect.Float32, reflect.Float64:
 		return a.Float() < b.Float()
 	case reflect.String:
 		return a.String() < b.String()
 	case reflect.Uintptr:
 		return a.Uint() < b.Uint()
 	case reflect.Array:
 		// Compare the contents of both arrays.
 		l := a.Len()
 		for i := 0; i < l; i++ {
 			av := a.Index(i)
 			bv := b.Index(i)
 			if av.Interface() == bv.Interface() {
 				continue
 			}
 			return valueSortLess(av, bv)
 		}
 	}
 	return a.String() < b.String()
 }
 // Less returns whether the value at index i should sort before the
 // value at index j.  It is part of the sort.Interface implementation.
 func (s *valuesSorter) Less(i, j int) bool {
 	if s.strings == nil {
 		return valueSortLess(s.values[i], s.values[j])
 	}
 	return s.strings[i] < s.strings[j]
 }
 // sortValues is a sort function that handles both native types and any type that
 // can be converted to error or Stringer.  Other inputs are sorted according to
 // their Value.String() value to ensure display stability.
 func sortValues(values []reflect.Value, cs *ConfigState) {
 	if len(values) == 0 {
 		return
 	}
 	sort.Sort(newValuesSorter(values, cs))
 }
--- a/vendor/github.com/davecgh/go-spew/spew/config.go
+++ b/vendor/github.com/davecgh/go-spew/spew/config.go
@ -0,0 +1,297 @@
 /*
 * Copyright (c) 2013 Dave Collins <dave@davec.name>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 package spew
 import (
 	"bytes"
 	"fmt"
 	"io"
 	"os"
 )
 // ConfigState houses the configuration options used by spew to format and
 // display values.  There is a global instance, Config, that is used to control
 // all top-level Formatter and Dump functionality.  Each ConfigState instance
 // provides methods equivalent to the top-level functions.
 //
 // The zero value for ConfigState provides no indentation.  You would typically
 // want to set it to a space or a tab.
 //
 // Alternatively, you can use NewDefaultConfig to get a ConfigState instance
 // with default settings.  See the documentation of NewDefaultConfig for default
 // values.
 type ConfigState struct {
 	// Indent specifies the string to use for each indentation level.  The
 	// global config instance that all top-level functions use set this to a
 	// single space by default.  If you would like more indentation, you might
 	// set this to a tab with "\t" or perhaps two spaces with "  ".
 	Indent string
 	// MaxDepth controls the maximum number of levels to descend into nested
 	// data structures.  The default, 0, means there is no limit.
 	//
 	// NOTE: Circular data structures are properly detected, so it is not
 	// necessary to set this value unless you specifically want to limit deeply
 	// nested data structures.
 	MaxDepth int
 	// DisableMethods specifies whether or not error and Stringer interfaces are
 	// invoked for types that implement them.
 	DisableMethods bool
 	// DisablePointerMethods specifies whether or not to check for and invoke
 	// error and Stringer interfaces on types which only accept a pointer
 	// receiver when the current type is not a pointer.
 	//
 	// NOTE: This might be an unsafe action since calling one of these methods
 	// with a pointer receiver could technically mutate the value, however,
 	// in practice, types which choose to satisify an error or Stringer
 	// interface with a pointer receiver should not be mutating their state
 	// inside these interface methods.  As a result, this option relies on
 	// access to the unsafe package, so it will not have any effect when
 	// running in environments without access to the unsafe package such as
 	// Google App Engine or with the "safe" build tag specified.
 	DisablePointerMethods bool
 	// ContinueOnMethod specifies whether or not recursion should continue once
 	// a custom error or Stringer interface is invoked.  The default, false,
 	// means it will print the results of invoking the custom error or Stringer
 	// interface and return immediately instead of continuing to recurse into
 	// the internals of the data type.
 	//
 	// NOTE: This flag does not have any effect if method invocation is disabled
 	// via the DisableMethods or DisablePointerMethods options.
 	ContinueOnMethod bool
 	// SortKeys specifies map keys should be sorted before being printed. Use
 	// this to have a more deterministic, diffable output.  Note that only
 	// native types (bool, int, uint, floats, uintptr and string) and types
 	// that support the error or Stringer interfaces (if methods are
 	// enabled) are supported, with other types sorted according to the
 	// reflect.Value.String() output which guarantees display stability.
 	SortKeys bool
 	// SpewKeys specifies that, as a last resort attempt, map keys should
 	// be spewed to strings and sorted by those strings.  This is only
 	// considered if SortKeys is true.
 	SpewKeys bool
 }
 // Config is the active configuration of the top-level functions.
 // The configuration can be changed by modifying the contents of spew.Config.
 var Config = ConfigState{Indent: " "}
 // Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns
 // the formatted string as a value that satisfies error.  See NewFormatter
 // for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Errorf(format, c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Errorf(format string, a ...interface{}) (err error) {
 	return fmt.Errorf(format, c.convertArgs(a)...)
 }
 // Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns
 // the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Fprint(w, c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Fprint(w io.Writer, a ...interface{}) (n int, err error) {
 	return fmt.Fprint(w, c.convertArgs(a)...)
 }
 // Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns
 // the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Fprintf(w, format, c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
 	return fmt.Fprintf(w, format, c.convertArgs(a)...)
 }
 // Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
 // passed with a Formatter interface returned by c.NewFormatter.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Fprintln(w, c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
 	return fmt.Fprintln(w, c.convertArgs(a)...)
 }
 // Print is a wrapper for fmt.Print that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns
 // the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Print(c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Print(a ...interface{}) (n int, err error) {
 	return fmt.Print(c.convertArgs(a)...)
 }
 // Printf is a wrapper for fmt.Printf that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns
 // the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Printf(format, c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Printf(format string, a ...interface{}) (n int, err error) {
 	return fmt.Printf(format, c.convertArgs(a)...)
 }
 // Println is a wrapper for fmt.Println that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns
 // the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Println(c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Println(a ...interface{}) (n int, err error) {
 	return fmt.Println(c.convertArgs(a)...)
 }
 // Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns
 // the resulting string.  See NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Sprint(c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Sprint(a ...interface{}) string {
 	return fmt.Sprint(c.convertArgs(a)...)
 }
 // Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
 // passed with a Formatter interface returned by c.NewFormatter.  It returns
 // the resulting string.  See NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Sprintf(format, c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Sprintf(format string, a ...interface{}) string {
 	return fmt.Sprintf(format, c.convertArgs(a)...)
 }
 // Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
 // were passed with a Formatter interface returned by c.NewFormatter.  It
 // returns the resulting string.  See NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Sprintln(c.NewFormatter(a), c.NewFormatter(b))
 func (c *ConfigState) Sprintln(a ...interface{}) string {
 	return fmt.Sprintln(c.convertArgs(a)...)
 }
 /*
 NewFormatter returns a custom formatter that satisfies the fmt.Formatter
 interface.  As a result, it integrates cleanly with standard fmt package
 printing functions.  The formatter is useful for inline printing of smaller data
 types similar to the standard %v format specifier.
 The custom formatter only responds to the %v (most compact), %+v (adds pointer
 addresses), %#v (adds types), and %#+v (adds types and pointer addresses) verb
 combinations.  Any other verbs such as %x and %q will be sent to the the
 standard fmt package for formatting.  In addition, the custom formatter ignores
 the width and precision arguments (however they will still work on the format
 specifiers not handled by the custom formatter).
 Typically this function shouldn't be called directly.  It is much easier to make
 use of the custom formatter by calling one of the convenience functions such as
 c.Printf, c.Println, or c.Printf.
 */
 func (c *ConfigState) NewFormatter(v interface{}) fmt.Formatter {
 	return newFormatter(c, v)
 }
 // Fdump formats and displays the passed arguments to io.Writer w.  It formats
 // exactly the same as Dump.
 func (c *ConfigState) Fdump(w io.Writer, a ...interface{}) {
 	fdump(c, w, a...)
 }
 /*
 Dump displays the passed parameters to standard out with newlines, customizable
 indentation, and additional debug information such as complete types and all
 pointer addresses used to indirect to the final value.  It provides the
 following features over the built-in printing facilities provided by the fmt
 package:
 	* Pointers are dereferenced and followed
 	* Circular data structures are detected and handled properly
 	* Custom Stringer/error interfaces are optionally invoked, including
 	  on unexported types
 	* Custom types which only implement the Stringer/error interfaces via
 	  a pointer receiver are optionally invoked when passing non-pointer
 	  variables
 	* Byte arrays and slices are dumped like the hexdump -C command which
 	  includes offsets, byte values in hex, and ASCII output
 The configuration options are controlled by modifying the public members
 of c.  See ConfigState for options documentation.
 See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
 get the formatted result as a string.
 */
 func (c *ConfigState) Dump(a ...interface{}) {
 	fdump(c, os.Stdout, a...)
 }
 // Sdump returns a string with the passed arguments formatted exactly the same
 // as Dump.
 func (c *ConfigState) Sdump(a ...interface{}) string {
 	var buf bytes.Buffer
 	fdump(c, &buf, a...)
 	return buf.String()
 }
 // convertArgs accepts a slice of arguments and returns a slice of the same
 // length with each argument converted to a spew Formatter interface using
 // the ConfigState associated with s.
 func (c *ConfigState) convertArgs(args []interface{}) (formatters []interface{}) {
 	formatters = make([]interface{}, len(args))
 	for index, arg := range args {
 		formatters[index] = newFormatter(c, arg)
 	}
 	return formatters
 }
 // NewDefaultConfig returns a ConfigState with the following default settings.
 //
 // 	Indent: " "
 // 	MaxDepth: 0
 // 	DisableMethods: false
 // 	DisablePointerMethods: false
 // 	ContinueOnMethod: false
 // 	SortKeys: false
 func NewDefaultConfig() *ConfigState {
 	return &ConfigState{Indent: " "}
 }
--- a/vendor/github.com/davecgh/go-spew/spew/doc.go
+++ b/vendor/github.com/davecgh/go-spew/spew/doc.go
@ -0,0 +1,202 @@
 /*
 * Copyright (c) 2013 Dave Collins <dave@davec.name>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 /*
 Package spew implements a deep pretty printer for Go data structures to aid in
 debugging.
 A quick overview of the additional features spew provides over the built-in
 printing facilities for Go data types are as follows:
 	* Pointers are dereferenced and followed
 	* Circular data structures are detected and handled properly
 	* Custom Stringer/error interfaces are optionally invoked, including
 	  on unexported types
 	* Custom types which only implement the Stringer/error interfaces via
 	  a pointer receiver are optionally invoked when passing non-pointer
 	  variables
 	* Byte arrays and slices are dumped like the hexdump -C command which
 	  includes offsets, byte values in hex, and ASCII output (only when using
 	  Dump style)
 There are two different approaches spew allows for dumping Go data structures:
 	* Dump style which prints with newlines, customizable indentation,
 	  and additional debug information such as types and all pointer addresses
 	  used to indirect to the final value
 	* A custom Formatter interface that integrates cleanly with the standard fmt
 	  package and replaces %v, %+v, %#v, and %#+v to provide inline printing
 	  similar to the default %v while providing the additional functionality
 	  outlined above and passing unsupported format verbs such as %x and %q
 	  along to fmt
 Quick Start
 This section demonstrates how to quickly get started with spew.  See the
 sections below for further details on formatting and configuration options.
 To dump a variable with full newlines, indentation, type, and pointer
 information use Dump, Fdump, or Sdump:
 	spew.Dump(myVar1, myVar2, ...)
 	spew.Fdump(someWriter, myVar1, myVar2, ...)
 	str := spew.Sdump(myVar1, myVar2, ...)
 Alternatively, if you would prefer to use format strings with a compacted inline
 printing style, use the convenience wrappers Printf, Fprintf, etc with
 %v (most compact), %+v (adds pointer addresses), %#v (adds types), or
 %#+v (adds types and pointer addresses):
 	spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
 	spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
 	spew.Fprintf(someWriter, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
 	spew.Fprintf(someWriter, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
 Configuration Options
 Configuration of spew is handled by fields in the ConfigState type.  For
 convenience, all of the top-level functions use a global state available
 via the spew.Config global.
 It is also possible to create a ConfigState instance that provides methods
 equivalent to the top-level functions.  This allows concurrent configuration
 options.  See the ConfigState documentation for more details.
 The following configuration options are available:
 	* Indent
 		String to use for each indentation level for Dump functions.
 		It is a single space by default.  A popular alternative is "\t".
 	* MaxDepth
 		Maximum number of levels to descend into nested data structures.
 		There is no limit by default.
 	* DisableMethods
 		Disables invocation of error and Stringer interface methods.
 		Method invocation is enabled by default.
 	* DisablePointerMethods
 		Disables invocation of error and Stringer interface methods on types
 		which only accept pointer receivers from non-pointer variables.
 		Pointer method invocation is enabled by default.
 	* ContinueOnMethod
 		Enables recursion into types after invoking error and Stringer interface
 		methods. Recursion after method invocation is disabled by default.
 	* SortKeys
 		Specifies map keys should be sorted before being printed. Use
 		this to have a more deterministic, diffable output.  Note that
 		only native types (bool, int, uint, floats, uintptr and string)
 		and types which implement error or Stringer interfaces are
 		supported with other types sorted according to the
 		reflect.Value.String() output which guarantees display
 		stability.  Natural map order is used by default.
 	* SpewKeys
 		Specifies that, as a last resort attempt, map keys should be
 		spewed to strings and sorted by those strings.  This is only
 		considered if SortKeys is true.
 Dump Usage
 Simply call spew.Dump with a list of variables you want to dump:
 	spew.Dump(myVar1, myVar2, ...)
 You may also call spew.Fdump if you would prefer to output to an arbitrary
 io.Writer.  For example, to dump to standard error:
 	spew.Fdump(os.Stderr, myVar1, myVar2, ...)
 A third option is to call spew.Sdump to get the formatted output as a string:
 	str := spew.Sdump(myVar1, myVar2, ...)
 Sample Dump Output
 See the Dump example for details on the setup of the types and variables being
 shown here.
 	(main.Foo) {
 	 unexportedField: (*main.Bar)(0xf84002e210)({
 	  flag: (main.Flag) flagTwo,
 	  data: (uintptr) <nil>
 	 }),
 	 ExportedField: (map[interface {}]interface {}) (len=1) {
 	  (string) (len=3) "one": (bool) true
 	 }
 	}
 Byte (and uint8) arrays and slices are displayed uniquely like the hexdump -C
 command as shown.
 	([]uint8) (len=32 cap=32) {
 	 00000000  11 12 13 14 15 16 17 18  19 1a 1b 1c 1d 1e 1f 20  |............... |
 	 00000010  21 22 23 24 25 26 27 28  29 2a 2b 2c 2d 2e 2f 30  |!"#$%&'()*+,-./0|
 	 00000020  31 32                                             |12|
 	}
 Custom Formatter
 Spew provides a custom formatter that implements the fmt.Formatter interface
 so that it integrates cleanly with standard fmt package printing functions. The
 formatter is useful for inline printing of smaller data types similar to the
 standard %v format specifier.
 The custom formatter only responds to the %v (most compact), %+v (adds pointer
 addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
 combinations.  Any other verbs such as %x and %q will be sent to the the
 standard fmt package for formatting.  In addition, the custom formatter ignores
 the width and precision arguments (however they will still work on the format
 specifiers not handled by the custom formatter).
 Custom Formatter Usage
 The simplest way to make use of the spew custom formatter is to call one of the
 convenience functions such as spew.Printf, spew.Println, or spew.Printf.  The
 functions have syntax you are most likely already familiar with:
 	spew.Printf("myVar1: %v -- myVar2: %+v", myVar1, myVar2)
 	spew.Printf("myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
 	spew.Println(myVar, myVar2)
 	spew.Fprintf(os.Stderr, "myVar1: %v -- myVar2: %+v", myVar1, myVar2)
 	spew.Fprintf(os.Stderr, "myVar3: %#v -- myVar4: %#+v", myVar3, myVar4)
 See the Index for the full list convenience functions.
 Sample Formatter Output
 Double pointer to a uint8:
 	  %v: <**>5
 	 %+v: <**>(0xf8400420d0->0xf8400420c8)5
 	 %#v: (**uint8)5
 	%#+v: (**uint8)(0xf8400420d0->0xf8400420c8)5
 Pointer to circular struct with a uint8 field and a pointer to itself:
 	  %v: <*>{1 <*><shown>}
 	 %+v: <*>(0xf84003e260){ui8:1 c:<*>(0xf84003e260)<shown>}
 	 %#v: (*main.circular){ui8:(uint8)1 c:(*main.circular)<shown>}
 	%#+v: (*main.circular)(0xf84003e260){ui8:(uint8)1 c:(*main.circular)(0xf84003e260)<shown>}
 See the Printf example for details on the setup of variables being shown
 here.
 Errors
 Since it is possible for custom Stringer/error interfaces to panic, spew
 detects them and handles them internally by printing the panic information
 inline with the output.  Since spew is intended to provide deep pretty printing
 capabilities on structures, it intentionally does not return any errors.
 */
 package spew
--- a/vendor/github.com/davecgh/go-spew/spew/dump.go
+++ b/vendor/github.com/davecgh/go-spew/spew/dump.go
@ -0,0 +1,509 @@
 /*
 * Copyright (c) 2013 Dave Collins <dave@davec.name>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 package spew
 import (
 	"bytes"
 	"encoding/hex"
 	"fmt"
 	"io"
 	"os"
 	"reflect"
 	"regexp"
 	"strconv"
 	"strings"
 )
 var (
 	// uint8Type is a reflect.Type representing a uint8.  It is used to
 	// convert cgo types to uint8 slices for hexdumping.
 	uint8Type = reflect.TypeOf(uint8(0))
 	// cCharRE is a regular expression that matches a cgo char.
 	// It is used to detect character arrays to hexdump them.
 	cCharRE = regexp.MustCompile("^.*\\._Ctype_char$")
 	// cUnsignedCharRE is a regular expression that matches a cgo unsigned
 	// char.  It is used to detect unsigned character arrays to hexdump
 	// them.
 	cUnsignedCharRE = regexp.MustCompile("^.*\\._Ctype_unsignedchar$")
 	// cUint8tCharRE is a regular expression that matches a cgo uint8_t.
 	// It is used to detect uint8_t arrays to hexdump them.
 	cUint8tCharRE = regexp.MustCompile("^.*\\._Ctype_uint8_t$")
 )
 // dumpState contains information about the state of a dump operation.
 type dumpState struct {
 	w                io.Writer
 	depth            int
 	pointers         map[uintptr]int
 	ignoreNextType   bool
 	ignoreNextIndent bool
 	cs               *ConfigState
 }
 // indent performs indentation according to the depth level and cs.Indent
 // option.
 func (d *dumpState) indent() {
 	if d.ignoreNextIndent {
 		d.ignoreNextIndent = false
 		return
 	}
 	d.w.Write(bytes.Repeat([]byte(d.cs.Indent), d.depth))
 }
 // unpackValue returns values inside of non-nil interfaces when possible.
 // This is useful for data types like structs, arrays, slices, and maps which
 // can contain varying types packed inside an interface.
 func (d *dumpState) unpackValue(v reflect.Value) reflect.Value {
 	if v.Kind() == reflect.Interface && !v.IsNil() {
 		v = v.Elem()
 	}
 	return v
 }
 // dumpPtr handles formatting of pointers by indirecting them as necessary.
 func (d *dumpState) dumpPtr(v reflect.Value) {
 	// Remove pointers at or below the current depth from map used to detect
 	// circular refs.
 	for k, depth := range d.pointers {
 		if depth >= d.depth {
 			delete(d.pointers, k)
 		}
 	}
 	// Keep list of all dereferenced pointers to show later.
 	pointerChain := make([]uintptr, 0)
 	// Figure out how many levels of indirection there are by dereferencing
 	// pointers and unpacking interfaces down the chain while detecting circular
 	// references.
 	nilFound := false
 	cycleFound := false
 	indirects := 0
 	ve := v
 	for ve.Kind() == reflect.Ptr {
 		if ve.IsNil() {
 			nilFound = true
 			break
 		}
 		indirects++
 		addr := ve.Pointer()
 		pointerChain = append(pointerChain, addr)
 		if pd, ok := d.pointers[addr]; ok && pd < d.depth {
 			cycleFound = true
 			indirects--
 			break
 		}
 		d.pointers[addr] = d.depth
 		ve = ve.Elem()
 		if ve.Kind() == reflect.Interface {
 			if ve.IsNil() {
 				nilFound = true
 				break
 			}
 			ve = ve.Elem()
 		}
 	}
 	// Display type information.
 	d.w.Write(openParenBytes)
 	d.w.Write(bytes.Repeat(asteriskBytes, indirects))
 	d.w.Write([]byte(ve.Type().String()))
 	d.w.Write(closeParenBytes)
 	// Display pointer information.
 	if len(pointerChain) > 0 {
 		d.w.Write(openParenBytes)
 		for i, addr := range pointerChain {
 			if i > 0 {
 				d.w.Write(pointerChainBytes)
 			}
 			printHexPtr(d.w, addr)
 		}
 		d.w.Write(closeParenBytes)
 	}
 	// Display dereferenced value.
 	d.w.Write(openParenBytes)
 	switch {
 	case nilFound == true:
 		d.w.Write(nilAngleBytes)
 	case cycleFound == true:
 		d.w.Write(circularBytes)
 	default:
 		d.ignoreNextType = true
 		d.dump(ve)
 	}
 	d.w.Write(closeParenBytes)
 }
 // dumpSlice handles formatting of arrays and slices.  Byte (uint8 under
 // reflection) arrays and slices are dumped in hexdump -C fashion.
 func (d *dumpState) dumpSlice(v reflect.Value) {
 	// Determine whether this type should be hex dumped or not.  Also,
 	// for types which should be hexdumped, try to use the underlying data
 	// first, then fall back to trying to convert them to a uint8 slice.
 	var buf []uint8
 	doConvert := false
 	doHexDump := false
 	numEntries := v.Len()
 	if numEntries > 0 {
 		vt := v.Index(0).Type()
 		vts := vt.String()
 		switch {
 		// C types that need to be converted.
 		case cCharRE.MatchString(vts):
 			fallthrough
 		case cUnsignedCharRE.MatchString(vts):
 			fallthrough
 		case cUint8tCharRE.MatchString(vts):
 			doConvert = true
 		// Try to use existing uint8 slices and fall back to converting
 		// and copying if that fails.
 		case vt.Kind() == reflect.Uint8:
 			// We need an addressable interface to convert the type
 			// to a byte slice.  However, the reflect package won't
 			// give us an interface on certain things like
 			// unexported struct fields in order to enforce
 			// visibility rules.  We use unsafe, when available, to
 			// bypass these restrictions since this package does not
 			// mutate the values.
 			vs := v
 			if !vs.CanInterface() || !vs.CanAddr() {
 				vs = unsafeReflectValue(vs)
 			}
 			if !UnsafeDisabled {
 				vs = vs.Slice(0, numEntries)
 				// Use the existing uint8 slice if it can be
 				// type asserted.
 				iface := vs.Interface()
 				if slice, ok := iface.([]uint8); ok {
 					buf = slice
 					doHexDump = true
 					break
 				}
 			}
 			// The underlying data needs to be converted if it can't
 			// be type asserted to a uint8 slice.
 			doConvert = true
 		}
 		// Copy and convert the underlying type if needed.
 		if doConvert && vt.ConvertibleTo(uint8Type) {
 			// Convert and copy each element into a uint8 byte
 			// slice.
 			buf = make([]uint8, numEntries)
 			for i := 0; i < numEntries; i++ {
 				vv := v.Index(i)
 				buf[i] = uint8(vv.Convert(uint8Type).Uint())
 			}
 			doHexDump = true
 		}
 	}
 	// Hexdump the entire slice as needed.
 	if doHexDump {
 		indent := strings.Repeat(d.cs.Indent, d.depth)
 		str := indent + hex.Dump(buf)
 		str = strings.Replace(str, "\n", "\n"+indent, -1)
 		str = strings.TrimRight(str, d.cs.Indent)
 		d.w.Write([]byte(str))
 		return
 	}
 	// Recursively call dump for each item.
 	for i := 0; i < numEntries; i++ {
 		d.dump(d.unpackValue(v.Index(i)))
 		if i < (numEntries - 1) {
 			d.w.Write(commaNewlineBytes)
 		} else {
 			d.w.Write(newlineBytes)
 		}
 	}
 }
 // dump is the main workhorse for dumping a value.  It uses the passed reflect
 // value to figure out what kind of object we are dealing with and formats it
 // appropriately.  It is a recursive function, however circular data structures
 // are detected and handled properly.
 func (d *dumpState) dump(v reflect.Value) {
 	// Handle invalid reflect values immediately.
 	kind := v.Kind()
 	if kind == reflect.Invalid {
 		d.w.Write(invalidAngleBytes)
 		return
 	}
 	// Handle pointers specially.
 	if kind == reflect.Ptr {
 		d.indent()
 		d.dumpPtr(v)
 		return
 	}
 	// Print type information unless already handled elsewhere.
 	if !d.ignoreNextType {
 		d.indent()
 		d.w.Write(openParenBytes)
 		d.w.Write([]byte(v.Type().String()))
 		d.w.Write(closeParenBytes)
 		d.w.Write(spaceBytes)
 	}
 	d.ignoreNextType = false
 	// Display length and capacity if the built-in len and cap functions
 	// work with the value's kind and the len/cap itself is non-zero.
 	valueLen, valueCap := 0, 0
 	switch v.Kind() {
 	case reflect.Array, reflect.Slice, reflect.Chan:
 		valueLen, valueCap = v.Len(), v.Cap()
 	case reflect.Map, reflect.String:
 		valueLen = v.Len()
 	}
 	if valueLen != 0 || valueCap != 0 {
 		d.w.Write(openParenBytes)
 		if valueLen != 0 {
 			d.w.Write(lenEqualsBytes)
 			printInt(d.w, int64(valueLen), 10)
 		}
 		if valueCap != 0 {
 			if valueLen != 0 {
 				d.w.Write(spaceBytes)
 			}
 			d.w.Write(capEqualsBytes)
 			printInt(d.w, int64(valueCap), 10)
 		}
 		d.w.Write(closeParenBytes)
 		d.w.Write(spaceBytes)
 	}
 	// Call Stringer/error interfaces if they exist and the handle methods flag
 	// is enabled
 	if !d.cs.DisableMethods {
 		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
 			if handled := handleMethods(d.cs, d.w, v); handled {
 				return
 			}
 		}
 	}
 	switch kind {
 	case reflect.Invalid:
 		// Do nothing.  We should never get here since invalid has already
 		// been handled above.
 	case reflect.Bool:
 		printBool(d.w, v.Bool())
 	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
 		printInt(d.w, v.Int(), 10)
 	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
 		printUint(d.w, v.Uint(), 10)
 	case reflect.Float32:
 		printFloat(d.w, v.Float(), 32)
 	case reflect.Float64:
 		printFloat(d.w, v.Float(), 64)
 	case reflect.Complex64:
 		printComplex(d.w, v.Complex(), 32)
 	case reflect.Complex128:
 		printComplex(d.w, v.Complex(), 64)
 	case reflect.Slice:
 		if v.IsNil() {
 			d.w.Write(nilAngleBytes)
 			break
 		}
 		fallthrough
 	case reflect.Array:
 		d.w.Write(openBraceNewlineBytes)
 		d.depth++
 		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
 			d.indent()
 			d.w.Write(maxNewlineBytes)
 		} else {
 			d.dumpSlice(v)
 		}
 		d.depth--
 		d.indent()
 		d.w.Write(closeBraceBytes)
 	case reflect.String:
 		d.w.Write([]byte(strconv.Quote(v.String())))
 	case reflect.Interface:
 		// The only time we should get here is for nil interfaces due to
 		// unpackValue calls.
 		if v.IsNil() {
 			d.w.Write(nilAngleBytes)
 		}
 	case reflect.Ptr:
 		// Do nothing.  We should never get here since pointers have already
 		// been handled above.
 	case reflect.Map:
 		// nil maps should be indicated as different than empty maps
 		if v.IsNil() {
 			d.w.Write(nilAngleBytes)
 			break
 		}
 		d.w.Write(openBraceNewlineBytes)
 		d.depth++
 		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
 			d.indent()
 			d.w.Write(maxNewlineBytes)
 		} else {
 			numEntries := v.Len()
 			keys := v.MapKeys()
 			if d.cs.SortKeys {
 				sortValues(keys, d.cs)
 			}
 			for i, key := range keys {
 				d.dump(d.unpackValue(key))
 				d.w.Write(colonSpaceBytes)
 				d.ignoreNextIndent = true
 				d.dump(d.unpackValue(v.MapIndex(key)))
 				if i < (numEntries - 1) {
 					d.w.Write(commaNewlineBytes)
 				} else {
 					d.w.Write(newlineBytes)
 				}
 			}
 		}
 		d.depth--
 		d.indent()
 		d.w.Write(closeBraceBytes)
 	case reflect.Struct:
 		d.w.Write(openBraceNewlineBytes)
 		d.depth++
 		if (d.cs.MaxDepth != 0) && (d.depth > d.cs.MaxDepth) {
 			d.indent()
 			d.w.Write(maxNewlineBytes)
 		} else {
 			vt := v.Type()
 			numFields := v.NumField()
 			for i := 0; i < numFields; i++ {
 				d.indent()
 				vtf := vt.Field(i)
 				d.w.Write([]byte(vtf.Name))
 				d.w.Write(colonSpaceBytes)
 				d.ignoreNextIndent = true
 				d.dump(d.unpackValue(v.Field(i)))
 				if i < (numFields - 1) {
 					d.w.Write(commaNewlineBytes)
 				} else {
 					d.w.Write(newlineBytes)
 				}
 			}
 		}
 		d.depth--
 		d.indent()
 		d.w.Write(closeBraceBytes)
 	case reflect.Uintptr:
 		printHexPtr(d.w, uintptr(v.Uint()))
 	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
 		printHexPtr(d.w, v.Pointer())
 	// There were not any other types at the time this code was written, but
 	// fall back to letting the default fmt package handle it in case any new
 	// types are added.
 	default:
 		if v.CanInterface() {
 			fmt.Fprintf(d.w, "%v", v.Interface())
 		} else {
 			fmt.Fprintf(d.w, "%v", v.String())
 		}
 	}
 }
 // fdump is a helper function to consolidate the logic from the various public
 // methods which take varying writers and config states.
 func fdump(cs *ConfigState, w io.Writer, a ...interface{}) {
 	for _, arg := range a {
 		if arg == nil {
 			w.Write(interfaceBytes)
 			w.Write(spaceBytes)
 			w.Write(nilAngleBytes)
 			w.Write(newlineBytes)
 			continue
 		}
 		d := dumpState{w: w, cs: cs}
 		d.pointers = make(map[uintptr]int)
 		d.dump(reflect.ValueOf(arg))
 		d.w.Write(newlineBytes)
 	}
 }
 // Fdump formats and displays the passed arguments to io.Writer w.  It formats
 // exactly the same as Dump.
 func Fdump(w io.Writer, a ...interface{}) {
 	fdump(&Config, w, a...)
 }
 // Sdump returns a string with the passed arguments formatted exactly the same
 // as Dump.
 func Sdump(a ...interface{}) string {
 	var buf bytes.Buffer
 	fdump(&Config, &buf, a...)
 	return buf.String()
 }
 /*
 Dump displays the passed parameters to standard out with newlines, customizable
 indentation, and additional debug information such as complete types and all
 pointer addresses used to indirect to the final value.  It provides the
 following features over the built-in printing facilities provided by the fmt
 package:
 	* Pointers are dereferenced and followed
 	* Circular data structures are detected and handled properly
 	* Custom Stringer/error interfaces are optionally invoked, including
 	  on unexported types
 	* Custom types which only implement the Stringer/error interfaces via
 	  a pointer receiver are optionally invoked when passing non-pointer
 	  variables
 	* Byte arrays and slices are dumped like the hexdump -C command which
 	  includes offsets, byte values in hex, and ASCII output
 The configuration options are controlled by an exported package global,
 spew.Config.  See ConfigState for options documentation.
 See Fdump if you would prefer dumping to an arbitrary io.Writer or Sdump to
 get the formatted result as a string.
 */
 func Dump(a ...interface{}) {
 	fdump(&Config, os.Stdout, a...)
 }
--- a/vendor/github.com/davecgh/go-spew/spew/format.go
+++ b/vendor/github.com/davecgh/go-spew/spew/format.go
@ -0,0 +1,419 @@
 /*
 * Copyright (c) 2013 Dave Collins <dave@davec.name>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 package spew
 import (
 	"bytes"
 	"fmt"
 	"reflect"
 	"strconv"
 	"strings"
 )
 // supportedFlags is a list of all the character flags supported by fmt package.
 const supportedFlags = "0-+# "
 // formatState implements the fmt.Formatter interface and contains information
 // about the state of a formatting operation.  The NewFormatter function can
 // be used to get a new Formatter which can be used directly as arguments
 // in standard fmt package printing calls.
 type formatState struct {
 	value          interface{}
 	fs             fmt.State
 	depth          int
 	pointers       map[uintptr]int
 	ignoreNextType bool
 	cs             *ConfigState
 }
 // buildDefaultFormat recreates the original format string without precision
 // and width information to pass in to fmt.Sprintf in the case of an
 // unrecognized type.  Unless new types are added to the language, this
 // function won't ever be called.
 func (f *formatState) buildDefaultFormat() (format string) {
 	buf := bytes.NewBuffer(percentBytes)
 	for _, flag := range supportedFlags {
 		if f.fs.Flag(int(flag)) {
 			buf.WriteRune(flag)
 		}
 	}
 	buf.WriteRune('v')
 	format = buf.String()
 	return format
 }
 // constructOrigFormat recreates the original format string including precision
 // and width information to pass along to the standard fmt package.  This allows
 // automatic deferral of all format strings this package doesn't support.
 func (f *formatState) constructOrigFormat(verb rune) (format string) {
 	buf := bytes.NewBuffer(percentBytes)
 	for _, flag := range supportedFlags {
 		if f.fs.Flag(int(flag)) {
 			buf.WriteRune(flag)
 		}
 	}
 	if width, ok := f.fs.Width(); ok {
 		buf.WriteString(strconv.Itoa(width))
 	}
 	if precision, ok := f.fs.Precision(); ok {
 		buf.Write(precisionBytes)
 		buf.WriteString(strconv.Itoa(precision))
 	}
 	buf.WriteRune(verb)
 	format = buf.String()
 	return format
 }
 // unpackValue returns values inside of non-nil interfaces when possible and
 // ensures that types for values which have been unpacked from an interface
 // are displayed when the show types flag is also set.
 // This is useful for data types like structs, arrays, slices, and maps which
 // can contain varying types packed inside an interface.
 func (f *formatState) unpackValue(v reflect.Value) reflect.Value {
 	if v.Kind() == reflect.Interface {
 		f.ignoreNextType = false
 		if !v.IsNil() {
 			v = v.Elem()
 		}
 	}
 	return v
 }
 // formatPtr handles formatting of pointers by indirecting them as necessary.
 func (f *formatState) formatPtr(v reflect.Value) {
 	// Display nil if top level pointer is nil.
 	showTypes := f.fs.Flag('#')
 	if v.IsNil() && (!showTypes || f.ignoreNextType) {
 		f.fs.Write(nilAngleBytes)
 		return
 	}
 	// Remove pointers at or below the current depth from map used to detect
 	// circular refs.
 	for k, depth := range f.pointers {
 		if depth >= f.depth {
 			delete(f.pointers, k)
 		}
 	}
 	// Keep list of all dereferenced pointers to possibly show later.
 	pointerChain := make([]uintptr, 0)
 	// Figure out how many levels of indirection there are by derferencing
 	// pointers and unpacking interfaces down the chain while detecting circular
 	// references.
 	nilFound := false
 	cycleFound := false
 	indirects := 0
 	ve := v
 	for ve.Kind() == reflect.Ptr {
 		if ve.IsNil() {
 			nilFound = true
 			break
 		}
 		indirects++
 		addr := ve.Pointer()
 		pointerChain = append(pointerChain, addr)
 		if pd, ok := f.pointers[addr]; ok && pd < f.depth {
 			cycleFound = true
 			indirects--
 			break
 		}
 		f.pointers[addr] = f.depth
 		ve = ve.Elem()
 		if ve.Kind() == reflect.Interface {
 			if ve.IsNil() {
 				nilFound = true
 				break
 			}
 			ve = ve.Elem()
 		}
 	}
 	// Display type or indirection level depending on flags.
 	if showTypes && !f.ignoreNextType {
 		f.fs.Write(openParenBytes)
 		f.fs.Write(bytes.Repeat(asteriskBytes, indirects))
 		f.fs.Write([]byte(ve.Type().String()))
 		f.fs.Write(closeParenBytes)
 	} else {
 		if nilFound || cycleFound {
 			indirects += strings.Count(ve.Type().String(), "*")
 		}
 		f.fs.Write(openAngleBytes)
 		f.fs.Write([]byte(strings.Repeat("*", indirects)))
 		f.fs.Write(closeAngleBytes)
 	}
 	// Display pointer information depending on flags.
 	if f.fs.Flag('+') && (len(pointerChain) > 0) {
 		f.fs.Write(openParenBytes)
 		for i, addr := range pointerChain {
 			if i > 0 {
 				f.fs.Write(pointerChainBytes)
 			}
 			printHexPtr(f.fs, addr)
 		}
 		f.fs.Write(closeParenBytes)
 	}
 	// Display dereferenced value.
 	switch {
 	case nilFound == true:
 		f.fs.Write(nilAngleBytes)
 	case cycleFound == true:
 		f.fs.Write(circularShortBytes)
 	default:
 		f.ignoreNextType = true
 		f.format(ve)
 	}
 }
 // format is the main workhorse for providing the Formatter interface.  It
 // uses the passed reflect value to figure out what kind of object we are
 // dealing with and formats it appropriately.  It is a recursive function,
 // however circular data structures are detected and handled properly.
 func (f *formatState) format(v reflect.Value) {
 	// Handle invalid reflect values immediately.
 	kind := v.Kind()
 	if kind == reflect.Invalid {
 		f.fs.Write(invalidAngleBytes)
 		return
 	}
 	// Handle pointers specially.
 	if kind == reflect.Ptr {
 		f.formatPtr(v)
 		return
 	}
 	// Print type information unless already handled elsewhere.
 	if !f.ignoreNextType && f.fs.Flag('#') {
 		f.fs.Write(openParenBytes)
 		f.fs.Write([]byte(v.Type().String()))
 		f.fs.Write(closeParenBytes)
 	}
 	f.ignoreNextType = false
 	// Call Stringer/error interfaces if they exist and the handle methods
 	// flag is enabled.
 	if !f.cs.DisableMethods {
 		if (kind != reflect.Invalid) && (kind != reflect.Interface) {
 			if handled := handleMethods(f.cs, f.fs, v); handled {
 				return
 			}
 		}
 	}
 	switch kind {
 	case reflect.Invalid:
 		// Do nothing.  We should never get here since invalid has already
 		// been handled above.
 	case reflect.Bool:
 		printBool(f.fs, v.Bool())
 	case reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int:
 		printInt(f.fs, v.Int(), 10)
 	case reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint:
 		printUint(f.fs, v.Uint(), 10)
 	case reflect.Float32:
 		printFloat(f.fs, v.Float(), 32)
 	case reflect.Float64:
 		printFloat(f.fs, v.Float(), 64)
 	case reflect.Complex64:
 		printComplex(f.fs, v.Complex(), 32)
 	case reflect.Complex128:
 		printComplex(f.fs, v.Complex(), 64)
 	case reflect.Slice:
 		if v.IsNil() {
 			f.fs.Write(nilAngleBytes)
 			break
 		}
 		fallthrough
 	case reflect.Array:
 		f.fs.Write(openBracketBytes)
 		f.depth++
 		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
 			f.fs.Write(maxShortBytes)
 		} else {
 			numEntries := v.Len()
 			for i := 0; i < numEntries; i++ {
 				if i > 0 {
 					f.fs.Write(spaceBytes)
 				}
 				f.ignoreNextType = true
 				f.format(f.unpackValue(v.Index(i)))
 			}
 		}
 		f.depth--
 		f.fs.Write(closeBracketBytes)
 	case reflect.String:
 		f.fs.Write([]byte(v.String()))
 	case reflect.Interface:
 		// The only time we should get here is for nil interfaces due to
 		// unpackValue calls.
 		if v.IsNil() {
 			f.fs.Write(nilAngleBytes)
 		}
 	case reflect.Ptr:
 		// Do nothing.  We should never get here since pointers have already
 		// been handled above.
 	case reflect.Map:
 		// nil maps should be indicated as different than empty maps
 		if v.IsNil() {
 			f.fs.Write(nilAngleBytes)
 			break
 		}
 		f.fs.Write(openMapBytes)
 		f.depth++
 		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
 			f.fs.Write(maxShortBytes)
 		} else {
 			keys := v.MapKeys()
 			if f.cs.SortKeys {
 				sortValues(keys, f.cs)
 			}
 			for i, key := range keys {
 				if i > 0 {
 					f.fs.Write(spaceBytes)
 				}
 				f.ignoreNextType = true
 				f.format(f.unpackValue(key))
 				f.fs.Write(colonBytes)
 				f.ignoreNextType = true
 				f.format(f.unpackValue(v.MapIndex(key)))
 			}
 		}
 		f.depth--
 		f.fs.Write(closeMapBytes)
 	case reflect.Struct:
 		numFields := v.NumField()
 		f.fs.Write(openBraceBytes)
 		f.depth++
 		if (f.cs.MaxDepth != 0) && (f.depth > f.cs.MaxDepth) {
 			f.fs.Write(maxShortBytes)
 		} else {
 			vt := v.Type()
 			for i := 0; i < numFields; i++ {
 				if i > 0 {
 					f.fs.Write(spaceBytes)
 				}
 				vtf := vt.Field(i)
 				if f.fs.Flag('+') || f.fs.Flag('#') {
 					f.fs.Write([]byte(vtf.Name))
 					f.fs.Write(colonBytes)
 				}
 				f.format(f.unpackValue(v.Field(i)))
 			}
 		}
 		f.depth--
 		f.fs.Write(closeBraceBytes)
 	case reflect.Uintptr:
 		printHexPtr(f.fs, uintptr(v.Uint()))
 	case reflect.UnsafePointer, reflect.Chan, reflect.Func:
 		printHexPtr(f.fs, v.Pointer())
 	// There were not any other types at the time this code was written, but
 	// fall back to letting the default fmt package handle it if any get added.
 	default:
 		format := f.buildDefaultFormat()
 		if v.CanInterface() {
 			fmt.Fprintf(f.fs, format, v.Interface())
 		} else {
 			fmt.Fprintf(f.fs, format, v.String())
 		}
 	}
 }
 // Format satisfies the fmt.Formatter interface. See NewFormatter for usage
 // details.
 func (f *formatState) Format(fs fmt.State, verb rune) {
 	f.fs = fs
 	// Use standard formatting for verbs that are not v.
 	if verb != 'v' {
 		format := f.constructOrigFormat(verb)
 		fmt.Fprintf(fs, format, f.value)
 		return
 	}
 	if f.value == nil {
 		if fs.Flag('#') {
 			fs.Write(interfaceBytes)
 		}
 		fs.Write(nilAngleBytes)
 		return
 	}
 	f.format(reflect.ValueOf(f.value))
 }
 // newFormatter is a helper function to consolidate the logic from the various
 // public methods which take varying config states.
 func newFormatter(cs *ConfigState, v interface{}) fmt.Formatter {
 	fs := &formatState{value: v, cs: cs}
 	fs.pointers = make(map[uintptr]int)
 	return fs
 }
 /*
 NewFormatter returns a custom formatter that satisfies the fmt.Formatter
 interface.  As a result, it integrates cleanly with standard fmt package
 printing functions.  The formatter is useful for inline printing of smaller data
 types similar to the standard %v format specifier.
 The custom formatter only responds to the %v (most compact), %+v (adds pointer
 addresses), %#v (adds types), or %#+v (adds types and pointer addresses) verb
 combinations.  Any other verbs such as %x and %q will be sent to the the
 standard fmt package for formatting.  In addition, the custom formatter ignores
 the width and precision arguments (however they will still work on the format
 specifiers not handled by the custom formatter).
 Typically this function shouldn't be called directly.  It is much easier to make
 use of the custom formatter by calling one of the convenience functions such as
 Printf, Println, or Fprintf.
 */
 func NewFormatter(v interface{}) fmt.Formatter {
 	return newFormatter(&Config, v)
 }
--- a/vendor/github.com/davecgh/go-spew/spew/spew.go
+++ b/vendor/github.com/davecgh/go-spew/spew/spew.go
@ -0,0 +1,148 @@
 /*
 * Copyright (c) 2013 Dave Collins <dave@davec.name>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
 package spew
 import (
 	"fmt"
 	"io"
 )
 // Errorf is a wrapper for fmt.Errorf that treats each argument as if it were
 // passed with a default Formatter interface returned by NewFormatter.  It
 // returns the formatted string as a value that satisfies error.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Errorf(format, spew.NewFormatter(a), spew.NewFormatter(b))
 func Errorf(format string, a ...interface{}) (err error) {
 	return fmt.Errorf(format, convertArgs(a)...)
 }
 // Fprint is a wrapper for fmt.Fprint that treats each argument as if it were
 // passed with a default Formatter interface returned by NewFormatter.  It
 // returns the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Fprint(w, spew.NewFormatter(a), spew.NewFormatter(b))
 func Fprint(w io.Writer, a ...interface{}) (n int, err error) {
 	return fmt.Fprint(w, convertArgs(a)...)
 }
 // Fprintf is a wrapper for fmt.Fprintf that treats each argument as if it were
 // passed with a default Formatter interface returned by NewFormatter.  It
 // returns the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Fprintf(w, format, spew.NewFormatter(a), spew.NewFormatter(b))
 func Fprintf(w io.Writer, format string, a ...interface{}) (n int, err error) {
 	return fmt.Fprintf(w, format, convertArgs(a)...)
 }
 // Fprintln is a wrapper for fmt.Fprintln that treats each argument as if it
 // passed with a default Formatter interface returned by NewFormatter.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Fprintln(w, spew.NewFormatter(a), spew.NewFormatter(b))
 func Fprintln(w io.Writer, a ...interface{}) (n int, err error) {
 	return fmt.Fprintln(w, convertArgs(a)...)
 }
 // Print is a wrapper for fmt.Print that treats each argument as if it were
 // passed with a default Formatter interface returned by NewFormatter.  It
 // returns the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Print(spew.NewFormatter(a), spew.NewFormatter(b))
 func Print(a ...interface{}) (n int, err error) {
 	return fmt.Print(convertArgs(a)...)
 }
 // Printf is a wrapper for fmt.Printf that treats each argument as if it were
 // passed with a default Formatter interface returned by NewFormatter.  It
 // returns the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Printf(format, spew.NewFormatter(a), spew.NewFormatter(b))
 func Printf(format string, a ...interface{}) (n int, err error) {
 	return fmt.Printf(format, convertArgs(a)...)
 }
 // Println is a wrapper for fmt.Println that treats each argument as if it were
 // passed with a default Formatter interface returned by NewFormatter.  It
 // returns the number of bytes written and any write error encountered.  See
 // NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Println(spew.NewFormatter(a), spew.NewFormatter(b))
 func Println(a ...interface{}) (n int, err error) {
 	return fmt.Println(convertArgs(a)...)
 }
 // Sprint is a wrapper for fmt.Sprint that treats each argument as if it were
 // passed with a default Formatter interface returned by NewFormatter.  It
 // returns the resulting string.  See NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Sprint(spew.NewFormatter(a), spew.NewFormatter(b))
 func Sprint(a ...interface{}) string {
 	return fmt.Sprint(convertArgs(a)...)
 }
 // Sprintf is a wrapper for fmt.Sprintf that treats each argument as if it were
 // passed with a default Formatter interface returned by NewFormatter.  It
 // returns the resulting string.  See NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Sprintf(format, spew.NewFormatter(a), spew.NewFormatter(b))
 func Sprintf(format string, a ...interface{}) string {
 	return fmt.Sprintf(format, convertArgs(a)...)
 }
 // Sprintln is a wrapper for fmt.Sprintln that treats each argument as if it
 // were passed with a default Formatter interface returned by NewFormatter.  It
 // returns the resulting string.  See NewFormatter for formatting details.
 //
 // This function is shorthand for the following syntax:
 //
 //	fmt.Sprintln(spew.NewFormatter(a), spew.NewFormatter(b))
 func Sprintln(a ...interface{}) string {
 	return fmt.Sprintln(convertArgs(a)...)
 }
 // convertArgs accepts a slice of arguments and returns a slice of the same
 // length with each argument converted to a default spew Formatter interface.
 func convertArgs(args []interface{}) (formatters []interface{}) {
 	formatters = make([]interface{}, len(args))
 	for index, arg := range args {
 		formatters[index] = NewFormatter(arg)
 	}
 	return formatters
 }
--- a/vendor/github.com/pmezard/go-difflib/LICENSE
+++ b/vendor/github.com/pmezard/go-difflib/LICENSE
@ -0,0 +1,27 @@
 Copyright (c) 2013, Patrick Mezard
 All rights reserved.
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are
 met:
    Redistributions of source code must retain the above copyright
 notice, this list of conditions and the following disclaimer.
    Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
    The names of its contributors may not be used to endorse or promote
 products derived from this software without specific prior written
 permission.
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
--- a/vendor/github.com/pmezard/go-difflib/difflib/difflib.go
+++ b/vendor/github.com/pmezard/go-difflib/difflib/difflib.go
@ -0,0 +1,758 @@
 // Package difflib is a partial port of Python difflib module.
 //
 // It provides tools to compare sequences of strings and generate textual diffs.
 //
 // The following class and functions have been ported:
 //
 // - SequenceMatcher
 //
 // - unified_diff
 //
 // - context_diff
 //
 // Getting unified diffs was the main goal of the port. Keep in mind this code
 // is mostly suitable to output text differences in a human friendly way, there
 // are no guarantees generated diffs are consumable by patch(1).
 package difflib
 import (
 	"bufio"
 	"bytes"
 	"fmt"
 	"io"
 	"strings"
 )
 func min(a, b int) int {
 	if a < b {
 		return a
 	}
 	return b
 }
 func max(a, b int) int {
 	if a > b {
 		return a
 	}
 	return b
 }
 func calculateRatio(matches, length int) float64 {
 	if length > 0 {
 		return 2.0 * float64(matches) / float64(length)
 	}
 	return 1.0
 }
 type Match struct {
 	A    int
 	B    int
 	Size int
 }
 type OpCode struct {
 	Tag byte
 	I1  int
 	I2  int
 	J1  int
 	J2  int
 }
 // SequenceMatcher compares sequence of strings. The basic
 // algorithm predates, and is a little fancier than, an algorithm
 // published in the late 1980's by Ratcliff and Obershelp under the
 // hyperbolic name "gestalt pattern matching".  The basic idea is to find
 // the longest contiguous matching subsequence that contains no "junk"
 // elements (R-O doesn't address junk).  The same idea is then applied
 // recursively to the pieces of the sequences to the left and to the right
 // of the matching subsequence.  This does not yield minimal edit
 // sequences, but does tend to yield matches that "look right" to people.
 //
 // SequenceMatcher tries to compute a "human-friendly diff" between two
 // sequences.  Unlike e.g. UNIX(tm) diff, the fundamental notion is the
 // longest *contiguous* & junk-free matching subsequence.  That's what
 // catches peoples' eyes.  The Windows(tm) windiff has another interesting
 // notion, pairing up elements that appear uniquely in each sequence.
 // That, and the method here, appear to yield more intuitive difference
 // reports than does diff.  This method appears to be the least vulnerable
 // to synching up on blocks of "junk lines", though (like blank lines in
 // ordinary text files, or maybe "<P>" lines in HTML files).  That may be
 // because this is the only method of the 3 that has a *concept* of
 // "junk" <wink>.
 //
 // Timing:  Basic R-O is cubic time worst case and quadratic time expected
 // case.  SequenceMatcher is quadratic time for the worst case and has
 // expected-case behavior dependent in a complicated way on how many
 // elements the sequences have in common; best case time is linear.
 type SequenceMatcher struct {
 	a              []string
 	b              []string
 	b2j            map[string][]int
 	IsJunk         func(string) bool
 	autoJunk       bool
 	bJunk          map[string]struct{}
 	matchingBlocks []Match
 	fullBCount     map[string]int
 	bPopular       map[string]struct{}
 	opCodes        []OpCode
 }
 func NewMatcher(a, b []string) *SequenceMatcher {
 	m := SequenceMatcher{autoJunk: true}
 	m.SetSeqs(a, b)
 	return &m
 }
 func NewMatcherWithJunk(a, b []string, autoJunk bool,
 	isJunk func(string) bool) *SequenceMatcher {
 	m := SequenceMatcher{IsJunk: isJunk, autoJunk: autoJunk}
 	m.SetSeqs(a, b)
 	return &m
 }
 // Set two sequences to be compared.
 func (m *SequenceMatcher) SetSeqs(a, b []string) {
 	m.SetSeq1(a)
 	m.SetSeq2(b)
 }
 // Set the first sequence to be compared. The second sequence to be compared is
 // not changed.
 //
 // SequenceMatcher computes and caches detailed information about the second
 // sequence, so if you want to compare one sequence S against many sequences,
 // use .SetSeq2(s) once and call .SetSeq1(x) repeatedly for each of the other
 // sequences.
 //
 // See also SetSeqs() and SetSeq2().
 func (m *SequenceMatcher) SetSeq1(a []string) {
 	if &a == &m.a {
 		return
 	}
 	m.a = a
 	m.matchingBlocks = nil
 	m.opCodes = nil
 }
 // Set the second sequence to be compared. The first sequence to be compared is
 // not changed.
 func (m *SequenceMatcher) SetSeq2(b []string) {
 	if &b == &m.b {
 		return
 	}
 	m.b = b
 	m.matchingBlocks = nil
 	m.opCodes = nil
 	m.fullBCount = nil
 	m.chainB()
 }
 func (m *SequenceMatcher) chainB() {
 	// Populate line -> index mapping
 	b2j := map[string][]int{}
 	for i, s := range m.b {
 		indices := b2j[s]
 		indices = append(indices, i)
 		b2j[s] = indices
 	}
 	// Purge junk elements
 	m.bJunk = map[string]struct{}{}
 	if m.IsJunk != nil {
 		junk := m.bJunk
 		for s, _ := range b2j {
 			if m.IsJunk(s) {
 				junk[s] = struct{}{}
 			}
 		}
 		for s, _ := range junk {
 			delete(b2j, s)
 		}
 	}
 	// Purge remaining popular elements
 	popular := map[string]struct{}{}
 	n := len(m.b)
 	if m.autoJunk && n >= 200 {
 		ntest := n/100 + 1
 		for s, indices := range b2j {
 			if len(indices) > ntest {
 				popular[s] = struct{}{}
 			}
 		}
 		for s, _ := range popular {
 			delete(b2j, s)
 		}
 	}
 	m.bPopular = popular
 	m.b2j = b2j
 }
 func (m *SequenceMatcher) isBJunk(s string) bool {
 	_, ok := m.bJunk[s]
 	return ok
 }
 // Find longest matching block in a[alo:ahi] and b[blo:bhi].
 //
 // If IsJunk is not defined:
 //
 // Return (i,j,k) such that a[i:i+k] is equal to b[j:j+k], where
 //     alo <= i <= i+k <= ahi
 //     blo <= j <= j+k <= bhi
 // and for all (i',j',k') meeting those conditions,
 //     k >= k'
 //     i <= i'
 //     and if i == i', j <= j'
 //
 // In other words, of all maximal matching blocks, return one that
 // starts earliest in a, and of all those maximal matching blocks that
 // start earliest in a, return the one that starts earliest in b.
 //
 // If IsJunk is defined, first the longest matching block is
 // determined as above, but with the additional restriction that no
 // junk element appears in the block.  Then that block is extended as
 // far as possible by matching (only) junk elements on both sides.  So
 // the resulting block never matches on junk except as identical junk
 // happens to be adjacent to an "interesting" match.
 //
 // If no blocks match, return (alo, blo, 0).
 func (m *SequenceMatcher) findLongestMatch(alo, ahi, blo, bhi int) Match {
 	// CAUTION:  stripping common prefix or suffix would be incorrect.
 	// E.g.,
 	//    ab
 	//    acab
 	// Longest matching block is "ab", but if common prefix is
 	// stripped, it's "a" (tied with "b").  UNIX(tm) diff does so
 	// strip, so ends up claiming that ab is changed to acab by
 	// inserting "ca" in the middle.  That's minimal but unintuitive:
 	// "it's obvious" that someone inserted "ac" at the front.
 	// Windiff ends up at the same place as diff, but by pairing up
 	// the unique 'b's and then matching the first two 'a's.
 	besti, bestj, bestsize := alo, blo, 0
 	// find longest junk-free match
 	// during an iteration of the loop, j2len[j] = length of longest
 	// junk-free match ending with a[i-1] and b[j]
 	j2len := map[int]int{}
 	for i := alo; i != ahi; i++ {
 		// look at all instances of a[i] in b; note that because
 		// b2j has no junk keys, the loop is skipped if a[i] is junk
 		newj2len := map[int]int{}
 		for _, j := range m.b2j[m.a[i]] {
 			// a[i] matches b[j]
 			if j < blo {
 				continue
 			}
 			if j >= bhi {
 				break
 			}
 			k := j2len[j-1] + 1
 			newj2len[j] = k
 			if k > bestsize {
 				besti, bestj, bestsize = i-k+1, j-k+1, k
 			}
 		}
 		j2len = newj2len
 	}
 	// Extend the best by non-junk elements on each end.  In particular,
 	// "popular" non-junk elements aren't in b2j, which greatly speeds
 	// the inner loop above, but also means "the best" match so far
 	// doesn't contain any junk *or* popular non-junk elements.
 	for besti > alo && bestj > blo && !m.isBJunk(m.b[bestj-1]) &&
 		m.a[besti-1] == m.b[bestj-1] {
 		besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
 	}
 	for besti+bestsize < ahi && bestj+bestsize < bhi &&
 		!m.isBJunk(m.b[bestj+bestsize]) &&
 		m.a[besti+bestsize] == m.b[bestj+bestsize] {
 		bestsize += 1
 	}
 	// Now that we have a wholly interesting match (albeit possibly
 	// empty!), we may as well suck up the matching junk on each
 	// side of it too.  Can't think of a good reason not to, and it
 	// saves post-processing the (possibly considerable) expense of
 	// figuring out what to do with it.  In the case of an empty
 	// interesting match, this is clearly the right thing to do,
 	// because no other kind of match is possible in the regions.
 	for besti > alo && bestj > blo && m.isBJunk(m.b[bestj-1]) &&
 		m.a[besti-1] == m.b[bestj-1] {
 		besti, bestj, bestsize = besti-1, bestj-1, bestsize+1
 	}
 	for besti+bestsize < ahi && bestj+bestsize < bhi &&
 		m.isBJunk(m.b[bestj+bestsize]) &&
 		m.a[besti+bestsize] == m.b[bestj+bestsize] {
 		bestsize += 1
 	}
 	return Match{A: besti, B: bestj, Size: bestsize}
 }
 // Return list of triples describing matching subsequences.
 //
 // Each triple is of the form (i, j, n), and means that
 // a[i:i+n] == b[j:j+n].  The triples are monotonically increasing in
 // i and in j. It's also guaranteed that if (i, j, n) and (i', j', n') are
 // adjacent triples in the list, and the second is not the last triple in the
 // list, then i+n != i' or j+n != j'. IOW, adjacent triples never describe
 // adjacent equal blocks.
 //
 // The last triple is a dummy, (len(a), len(b), 0), and is the only
 // triple with n==0.
 func (m *SequenceMatcher) GetMatchingBlocks() []Match {
 	if m.matchingBlocks != nil {
 		return m.matchingBlocks
 	}
 	var matchBlocks func(alo, ahi, blo, bhi int, matched []Match) []Match
 	matchBlocks = func(alo, ahi, blo, bhi int, matched []Match) []Match {
 		match := m.findLongestMatch(alo, ahi, blo, bhi)
 		i, j, k := match.A, match.B, match.Size
 		if match.Size > 0 {
 			if alo < i && blo < j {
 				matched = matchBlocks(alo, i, blo, j, matched)
 			}
 			matched = append(matched, match)
 			if i+k < ahi && j+k < bhi {
 				matched = matchBlocks(i+k, ahi, j+k, bhi, matched)
 			}
 		}
 		return matched
 	}
 	matched := matchBlocks(0, len(m.a), 0, len(m.b), nil)
 	// It's possible that we have adjacent equal blocks in the
 	// matching_blocks list now.
 	nonAdjacent := []Match{}
 	i1, j1, k1 := 0, 0, 0
 	for _, b := range matched {
 		// Is this block adjacent to i1, j1, k1?
 		i2, j2, k2 := b.A, b.B, b.Size
 		if i1+k1 == i2 && j1+k1 == j2 {
 			// Yes, so collapse them -- this just increases the length of
 			// the first block by the length of the second, and the first
 			// block so lengthened remains the block to compare against.
 			k1 += k2
 		} else {
 			// Not adjacent.  Remember the first block (k1==0 means it's
 			// the dummy we started with), and make the second block the
 			// new block to compare against.
 			if k1 > 0 {
 				nonAdjacent = append(nonAdjacent, Match{i1, j1, k1})
 			}
 			i1, j1, k1 = i2, j2, k2
 		}
 	}
 	if k1 > 0 {
 		nonAdjacent = append(nonAdjacent, Match{i1, j1, k1})
 	}
 	nonAdjacent = append(nonAdjacent, Match{len(m.a), len(m.b), 0})
 	m.matchingBlocks = nonAdjacent
 	return m.matchingBlocks
 }
 // Return list of 5-tuples describing how to turn a into b.
 //
 // Each tuple is of the form (tag, i1, i2, j1, j2).  The first tuple
 // has i1 == j1 == 0, and remaining tuples have i1 == the i2 from the
 // tuple preceding it, and likewise for j1 == the previous j2.
 //
 // The tags are characters, with these meanings:
 //
 // 'r' (replace):  a[i1:i2] should be replaced by b[j1:j2]
 //
 // 'd' (delete):   a[i1:i2] should be deleted, j1==j2 in this case.
 //
 // 'i' (insert):   b[j1:j2] should be inserted at a[i1:i1], i1==i2 in this case.
 //
 // 'e' (equal):    a[i1:i2] == b[j1:j2]
 func (m *SequenceMatcher) GetOpCodes() []OpCode {
 	if m.opCodes != nil {
 		return m.opCodes
 	}
 	i, j := 0, 0
 	matching := m.GetMatchingBlocks()
 	opCodes := make([]OpCode, 0, len(matching))
 	for _, m := range matching {
 		//  invariant:  we've pumped out correct diffs to change
 		//  a[:i] into b[:j], and the next matching block is
 		//  a[ai:ai+size] == b[bj:bj+size]. So we need to pump
 		//  out a diff to change a[i:ai] into b[j:bj], pump out
 		//  the matching block, and move (i,j) beyond the match
 		ai, bj, size := m.A, m.B, m.Size
 		tag := byte(0)
 		if i < ai && j < bj {
 			tag = 'r'
 		} else if i < ai {
 			tag = 'd'
 		} else if j < bj {
 			tag = 'i'
 		}
 		if tag > 0 {
 			opCodes = append(opCodes, OpCode{tag, i, ai, j, bj})
 		}
 		i, j = ai+size, bj+size
 		// the list of matching blocks is terminated by a
 		// sentinel with size 0
 		if size > 0 {
 			opCodes = append(opCodes, OpCode{'e', ai, i, bj, j})
 		}
 	}
 	m.opCodes = opCodes
 	return m.opCodes
 }
 // Isolate change clusters by eliminating ranges with no changes.
 //
 // Return a generator of groups with up to n lines of context.
 // Each group is in the same format as returned by GetOpCodes().
 func (m *SequenceMatcher) GetGroupedOpCodes(n int) [][]OpCode {
 	if n < 0 {
 		n = 3
 	}
 	codes := m.GetOpCodes()
 	if len(codes) == 0 {
 		codes = []OpCode{OpCode{'e', 0, 1, 0, 1}}
 	}
 	// Fixup leading and trailing groups if they show no changes.
 	if codes[0].Tag == 'e' {
 		c := codes[0]
 		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
 		codes[0] = OpCode{c.Tag, max(i1, i2-n), i2, max(j1, j2-n), j2}
 	}
 	if codes[len(codes)-1].Tag == 'e' {
 		c := codes[len(codes)-1]
 		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
 		codes[len(codes)-1] = OpCode{c.Tag, i1, min(i2, i1+n), j1, min(j2, j1+n)}
 	}
 	nn := n + n
 	groups := [][]OpCode{}
 	group := []OpCode{}
 	for _, c := range codes {
 		i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
 		// End the current group and start a new one whenever
 		// there is a large range with no changes.
 		if c.Tag == 'e' && i2-i1 > nn {
 			group = append(group, OpCode{c.Tag, i1, min(i2, i1+n),
 				j1, min(j2, j1+n)})
 			groups = append(groups, group)
 			group = []OpCode{}
 			i1, j1 = max(i1, i2-n), max(j1, j2-n)
 		}
 		group = append(group, OpCode{c.Tag, i1, i2, j1, j2})
 	}
 	if len(group) > 0 && !(len(group) == 1 && group[0].Tag == 'e') {
 		groups = append(groups, group)
 	}
 	return groups
 }
 // Return a measure of the sequences' similarity (float in [0,1]).
 //
 // Where T is the total number of elements in both sequences, and
 // M is the number of matches, this is 2.0*M / T.
 // Note that this is 1 if the sequences are identical, and 0 if
 // they have nothing in common.
 //
 // .Ratio() is expensive to compute if you haven't already computed
 // .GetMatchingBlocks() or .GetOpCodes(), in which case you may
 // want to try .QuickRatio() or .RealQuickRation() first to get an
 // upper bound.
 func (m *SequenceMatcher) Ratio() float64 {
 	matches := 0
 	for _, m := range m.GetMatchingBlocks() {
 		matches += m.Size
 	}
 	return calculateRatio(matches, len(m.a)+len(m.b))
 }
 // Return an upper bound on ratio() relatively quickly.
 //
 // This isn't defined beyond that it is an upper bound on .Ratio(), and
 // is faster to compute.
 func (m *SequenceMatcher) QuickRatio() float64 {
 	// viewing a and b as multisets, set matches to the cardinality
 	// of their intersection; this counts the number of matches
 	// without regard to order, so is clearly an upper bound
 	if m.fullBCount == nil {
 		m.fullBCount = map[string]int{}
 		for _, s := range m.b {
 			m.fullBCount[s] = m.fullBCount[s] + 1
 		}
 	}
 	// avail[x] is the number of times x appears in 'b' less the
 	// number of times we've seen it in 'a' so far ... kinda
 	avail := map[string]int{}
 	matches := 0
 	for _, s := range m.a {
 		n, ok := avail[s]
 		if !ok {
 			n = m.fullBCount[s]
 		}
 		avail[s] = n - 1
 		if n > 0 {
 			matches += 1
 		}
 	}
 	return calculateRatio(matches, len(m.a)+len(m.b))
 }
 // Return an upper bound on ratio() very quickly.
 //
 // This isn't defined beyond that it is an upper bound on .Ratio(), and
 // is faster to compute than either .Ratio() or .QuickRatio().
 func (m *SequenceMatcher) RealQuickRatio() float64 {
 	la, lb := len(m.a), len(m.b)
 	return calculateRatio(min(la, lb), la+lb)
 }
 // Convert range to the "ed" format
 func formatRangeUnified(start, stop int) string {
 	// Per the diff spec at http://www.unix.org/single_unix_specification/
 	beginning := start + 1 // lines start numbering with one
 	length := stop - start
 	if length == 1 {
 		return fmt.Sprintf("%d", beginning)
 	}
 	if length == 0 {
 		beginning -= 1 // empty ranges begin at line just before the range
 	}
 	return fmt.Sprintf("%d,%d", beginning, length)
 }
 // Unified diff parameters
 type UnifiedDiff struct {
 	A        []string // First sequence lines
 	FromFile string   // First file name
 	FromDate string   // First file time
 	B        []string // Second sequence lines
 	ToFile   string   // Second file name
 	ToDate   string   // Second file time
 	Eol      string   // Headers end of line, defaults to LF
 	Context  int      // Number of context lines
 }
 // Compare two sequences of lines; generate the delta as a unified diff.
 //
 // Unified diffs are a compact way of showing line changes and a few
 // lines of context.  The number of context lines is set by 'n' which
 // defaults to three.
 //
 // By default, the diff control lines (those with ---, +++, or @@) are
 // created with a trailing newline.  This is helpful so that inputs
 // created from file.readlines() result in diffs that are suitable for
 // file.writelines() since both the inputs and outputs have trailing
 // newlines.
 //
 // For inputs that do not have trailing newlines, set the lineterm
 // argument to "" so that the output will be uniformly newline free.
 //
 // The unidiff format normally has a header for filenames and modification
 // times.  Any or all of these may be specified using strings for
 // 'fromfile', 'tofile', 'fromfiledate', and 'tofiledate'.
 // The modification times are normally expressed in the ISO 8601 format.
 func WriteUnifiedDiff(writer io.Writer, diff UnifiedDiff) error {
 	buf := bufio.NewWriter(writer)
 	defer buf.Flush()
 	w := func(format string, args ...interface{}) error {
 		_, err := buf.WriteString(fmt.Sprintf(format, args...))
 		return err
 	}
 	if len(diff.Eol) == 0 {
 		diff.Eol = "\n"
 	}
 	started := false
 	m := NewMatcher(diff.A, diff.B)
 	for _, g := range m.GetGroupedOpCodes(diff.Context) {
 		if !started {
 			started = true
 			fromDate := ""
 			if len(diff.FromDate) > 0 {
 				fromDate = "\t" + diff.FromDate
 			}
 			toDate := ""
 			if len(diff.ToDate) > 0 {
 				toDate = "\t" + diff.ToDate
 			}
 			err := w("--- %s%s%s", diff.FromFile, fromDate, diff.Eol)
 			if err != nil {
 				return err
 			}
 			err = w("+++ %s%s%s", diff.ToFile, toDate, diff.Eol)
 			if err != nil {
 				return err
 			}
 		}
 		first, last := g[0], g[len(g)-1]
 		range1 := formatRangeUnified(first.I1, last.I2)
 		range2 := formatRangeUnified(first.J1, last.J2)
 		if err := w("@@ -%s +%s @@%s", range1, range2, diff.Eol); err != nil {
 			return err
 		}
 		for _, c := range g {
 			i1, i2, j1, j2 := c.I1, c.I2, c.J1, c.J2
 			if c.Tag == 'e' {
 				for _, line := range diff.A[i1:i2] {
 					if err := w(" " + line); err != nil {
 						return err
 					}
 				}
 				continue
 			}
 			if c.Tag == 'r' || c.Tag == 'd' {
 				for _, line := range diff.A[i1:i2] {
 					if err := w("-" + line); err != nil {
 						return err
 					}
 				}
 			}
 			if c.Tag == 'r' || c.Tag == 'i' {
 				for _, line := range diff.B[j1:j2] {
 					if err := w("+" + line); err != nil {
 						return err
 					}
 				}
 			}
 		}
 	}
 	return nil
 }
 // Like WriteUnifiedDiff but returns the diff a string.
 func GetUnifiedDiffString(diff UnifiedDiff) (string, error) {
 	w := &bytes.Buffer{}
 	err := WriteUnifiedDiff(w, diff)
 	return string(w.Bytes()), err
 }
 // Convert range to the "ed" format.
 func formatRangeContext(start, stop int) string {
 	// Per the diff spec at http://www.unix.org/single_unix_specification/
 	beginning := start + 1 // lines start numbering with one
 	length := stop - start
 	if length == 0 {
 		beginning -= 1 // empty ranges begin at line just before the range
 	}
 	if length <= 1 {
 		return fmt.Sprintf("%d", beginning)
 	}
 	return fmt.Sprintf("%d,%d", beginning, beginning+length-1)
 }
 type ContextDiff UnifiedDiff
 // Compare two sequences of lines; generate the delta as a context diff.
 //
 // Context diffs are a compact way of showing line changes and a few
 // lines of context. The number of context lines is set by diff.Context
 // which defaults to three.
 //
 // By default, the diff control lines (those with *** or ---) are
 // created with a trailing newline.
 //
 // For inputs that do not have trailing newlines, set the diff.Eol
 // argument to "" so that the output will be uniformly newline free.
 //
 // The context diff format normally has a header for filenames and
 // modification times.  Any or all of these may be specified using
 // strings for diff.FromFile, diff.ToFile, diff.FromDate, diff.ToDate.
 // The modification times are normally expressed in the ISO 8601 format.
 // If not specified, the strings default to blanks.
 func WriteContextDiff(writer io.Writer, diff ContextDiff) error {
 	buf := bufio.NewWriter(writer)
 	defer buf.Flush()
 	var diffErr error
 	w := func(format string, args ...interface{}) {
 		_, err := buf.WriteString(fmt.Sprintf(format, args...))
 		if diffErr == nil && err != nil {
 			diffErr = err
 		}
 	}
 	if len(diff.Eol) == 0 {
 		diff.Eol = "\n"
 	}
 	prefix := map[byte]string{
 		'i': "+ ",
 		'd': "- ",
 		'r': "! ",
 		'e': "  ",
 	}
 	started := false
 	m := NewMatcher(diff.A, diff.B)
 	for _, g := range m.GetGroupedOpCodes(diff.Context) {
 		if !started {
 			started = true
 			fromDate := ""
 			if len(diff.FromDate) > 0 {
 				fromDate = "\t" + diff.FromDate
 			}
 			toDate := ""
 			if len(diff.ToDate) > 0 {
 				toDate = "\t" + diff.ToDate
 			}
 			w("*** %s%s%s", diff.FromFile, fromDate, diff.Eol)
 			w("--- %s%s%s", diff.ToFile, toDate, diff.Eol)
 		}
 		first, last := g[0], g[len(g)-1]
 		w("***************" + diff.Eol)
 		range1 := formatRangeContext(first.I1, last.I2)
 		w("*** %s ****%s", range1, diff.Eol)
 		for _, c := range g {
 			if c.Tag == 'r' || c.Tag == 'd' {
 				for _, cc := range g {
 					if cc.Tag == 'i' {
 						continue
 					}
 					for _, line := range diff.A[cc.I1:cc.I2] {
 						w(prefix[cc.Tag] + line)
 					}
 				}
 				break
 			}
 		}
 		range2 := formatRangeContext(first.J1, last.J2)
 		w("--- %s ----%s", range2, diff.Eol)
 		for _, c := range g {
 			if c.Tag == 'r' || c.Tag == 'i' {
 				for _, cc := range g {
 					if cc.Tag == 'd' {
 						continue
 					}
 					for _, line := range diff.B[cc.J1:cc.J2] {
 						w(prefix[cc.Tag] + line)
 					}
 				}
 				break
 			}
 		}
 	}
 	return diffErr
 }
 // Like WriteContextDiff but returns the diff a string.
 func GetContextDiffString(diff ContextDiff) (string, error) {
 	w := &bytes.Buffer{}
 	err := WriteContextDiff(w, diff)
 	return string(w.Bytes()), err
 }
 // Split a string on "\n" while preserving them. The output can be used
 // as input for UnifiedDiff and ContextDiff structures.
 func SplitLines(s string) []string {
 	lines := strings.SplitAfter(s, "\n")
 	lines[len(lines)-1] += "\n"
 	return lines
 }
--- a/vendor/github.com/stretchr/testify/LICENSE
+++ b/vendor/github.com/stretchr/testify/LICENSE
@ -0,0 +1,22 @@
 Copyright (c) 2012 - 2013 Mat Ryer and Tyler Bunnell
 Please consider promoting this project if you find it useful.
 Permission is hereby granted, free of charge, to any person 
 obtaining a copy of this software and associated documentation 
 files (the "Software"), to deal in the Software without restriction, 
 including without limitation the rights to use, copy, modify, merge, 
 publish, distribute, sublicense, and/or sell copies of the Software, 
 and to permit persons to whom the Software is furnished to do so, 
 subject to the following conditions:
 The above copyright notice and this permission notice shall be included
 in all copies or substantial portions of the Software.
 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 
 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES 
 OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. 
 IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, 
 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT 
 OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE 
 OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--- a/vendor/github.com/stretchr/testify/assert/assertion_forward.go
+++ b/vendor/github.com/stretchr/testify/assert/assertion_forward.go
@ -0,0 +1,346 @@
 /*
 * CODE GENERATED AUTOMATICALLY WITH github.com/stretchr/testify/_codegen
 * THIS FILE MUST NOT BE EDITED BY HAND
 */
 package assert
 import (
 	http "net/http"
 	url "net/url"
 	time "time"
 )
 // Condition uses a Comparison to assert a complex condition.
 func (a *Assertions) Condition(comp Comparison, msgAndArgs ...interface{}) bool {
 	return Condition(a.t, comp, msgAndArgs...)
 }
 // Contains asserts that the specified string, list(array, slice...) or map contains the
 // specified substring or element.
 //
 //    a.Contains("Hello World", "World", "But 'Hello World' does contain 'World'")
 //    a.Contains(["Hello", "World"], "World", "But ["Hello", "World"] does contain 'World'")
 //    a.Contains({"Hello": "World"}, "Hello", "But {'Hello': 'World'} does contain 'Hello'")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Contains(s interface{}, contains interface{}, msgAndArgs ...interface{}) bool {
 	return Contains(a.t, s, contains, msgAndArgs...)
 }
 // Empty asserts that the specified object is empty.  I.e. nil, "", false, 0 or either
 // a slice or a channel with len == 0.
 //
 //  a.Empty(obj)
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Empty(object interface{}, msgAndArgs ...interface{}) bool {
 	return Empty(a.t, object, msgAndArgs...)
 }
 // Equal asserts that two objects are equal.
 //
 //    a.Equal(123, 123, "123 and 123 should be equal")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Equal(expected interface{}, actual interface{}, msgAndArgs ...interface{}) bool {
 	return Equal(a.t, expected, actual, msgAndArgs...)
 }
 // EqualError asserts that a function returned an error (i.e. not `nil`)
 // and that it is equal to the provided error.
 //
 //   actualObj, err := SomeFunction()
 //   a.EqualError(err,  expectedErrorString, "An error was expected")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) EqualError(theError error, errString string, msgAndArgs ...interface{}) bool {
 	return EqualError(a.t, theError, errString, msgAndArgs...)
 }
 // EqualValues asserts that two objects are equal or convertable to the same types
 // and equal.
 //
 //    a.EqualValues(uint32(123), int32(123), "123 and 123 should be equal")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) EqualValues(expected interface{}, actual interface{}, msgAndArgs ...interface{}) bool {
 	return EqualValues(a.t, expected, actual, msgAndArgs...)
 }
 // Error asserts that a function returned an error (i.e. not `nil`).
 //
 //   actualObj, err := SomeFunction()
 //   if a.Error(err, "An error was expected") {
 // 	   assert.Equal(t, err, expectedError)
 //   }
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Error(err error, msgAndArgs ...interface{}) bool {
 	return Error(a.t, err, msgAndArgs...)
 }
 // Exactly asserts that two objects are equal is value and type.
 //
 //    a.Exactly(int32(123), int64(123), "123 and 123 should NOT be equal")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Exactly(expected interface{}, actual interface{}, msgAndArgs ...interface{}) bool {
 	return Exactly(a.t, expected, actual, msgAndArgs...)
 }
 // Fail reports a failure through
 func (a *Assertions) Fail(failureMessage string, msgAndArgs ...interface{}) bool {
 	return Fail(a.t, failureMessage, msgAndArgs...)
 }
 // FailNow fails test
 func (a *Assertions) FailNow(failureMessage string, msgAndArgs ...interface{}) bool {
 	return FailNow(a.t, failureMessage, msgAndArgs...)
 }
 // False asserts that the specified value is false.
 //
 //    a.False(myBool, "myBool should be false")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) False(value bool, msgAndArgs ...interface{}) bool {
 	return False(a.t, value, msgAndArgs...)
 }
 // HTTPBodyContains asserts that a specified handler returns a
 // body that contains a string.
 //
 //  a.HTTPBodyContains(myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) HTTPBodyContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) bool {
 	return HTTPBodyContains(a.t, handler, method, url, values, str)
 }
 // HTTPBodyNotContains asserts that a specified handler returns a
 // body that does not contain a string.
 //
 //  a.HTTPBodyNotContains(myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) HTTPBodyNotContains(handler http.HandlerFunc, method string, url string, values url.Values, str interface{}) bool {
 	return HTTPBodyNotContains(a.t, handler, method, url, values, str)
 }
 // HTTPError asserts that a specified handler returns an error status code.
 //
 //  a.HTTPError(myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) HTTPError(handler http.HandlerFunc, method string, url string, values url.Values) bool {
 	return HTTPError(a.t, handler, method, url, values)
 }
 // HTTPRedirect asserts that a specified handler returns a redirect status code.
 //
 //  a.HTTPRedirect(myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) HTTPRedirect(handler http.HandlerFunc, method string, url string, values url.Values) bool {
 	return HTTPRedirect(a.t, handler, method, url, values)
 }
 // HTTPSuccess asserts that a specified handler returns a success status code.
 //
 //  a.HTTPSuccess(myHandler, "POST", "http://www.google.com", nil)
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) HTTPSuccess(handler http.HandlerFunc, method string, url string, values url.Values) bool {
 	return HTTPSuccess(a.t, handler, method, url, values)
 }
 // Implements asserts that an object is implemented by the specified interface.
 //
 //    a.Implements((*MyInterface)(nil), new(MyObject), "MyObject")
 func (a *Assertions) Implements(interfaceObject interface{}, object interface{}, msgAndArgs ...interface{}) bool {
 	return Implements(a.t, interfaceObject, object, msgAndArgs...)
 }
 // InDelta asserts that the two numerals are within delta of each other.
 //
 // 	 a.InDelta(math.Pi, (22 / 7.0), 0.01)
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) InDelta(expected interface{}, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
 	return InDelta(a.t, expected, actual, delta, msgAndArgs...)
 }
 // InDeltaSlice is the same as InDelta, except it compares two slices.
 func (a *Assertions) InDeltaSlice(expected interface{}, actual interface{}, delta float64, msgAndArgs ...interface{}) bool {
 	return InDeltaSlice(a.t, expected, actual, delta, msgAndArgs...)
 }
 // InEpsilon asserts that expected and actual have a relative error less than epsilon
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) InEpsilon(expected interface{}, actual interface{}, epsilon float64, msgAndArgs ...interface{}) bool {
 	return InEpsilon(a.t, expected, actual, epsilon, msgAndArgs...)
 }
 // InEpsilonSlice is the same as InEpsilon, except it compares each value from two slices.
 func (a *Assertions) InEpsilonSlice(expected interface{}, actual interface{}, epsilon float64, msgAndArgs ...interface{}) bool {
 	return InEpsilonSlice(a.t, expected, actual, epsilon, msgAndArgs...)
 }
 // IsType asserts that the specified objects are of the same type.
 func (a *Assertions) IsType(expectedType interface{}, object interface{}, msgAndArgs ...interface{}) bool {
 	return IsType(a.t, expectedType, object, msgAndArgs...)
 }
 // JSONEq asserts that two JSON strings are equivalent.
 //
 //  a.JSONEq(`{"hello": "world", "foo": "bar"}`, `{"foo": "bar", "hello": "world"}`)
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) JSONEq(expected string, actual string, msgAndArgs ...interface{}) bool {
 	return JSONEq(a.t, expected, actual, msgAndArgs...)
 }
 // Len asserts that the specified object has specific length.
 // Len also fails if the object has a type that len() not accept.
 //
 //    a.Len(mySlice, 3, "The size of slice is not 3")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Len(object interface{}, length int, msgAndArgs ...interface{}) bool {
 	return Len(a.t, object, length, msgAndArgs...)
 }
 // Nil asserts that the specified object is nil.
 //
 //    a.Nil(err, "err should be nothing")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Nil(object interface{}, msgAndArgs ...interface{}) bool {
 	return Nil(a.t, object, msgAndArgs...)
 }
 // NoError asserts that a function returned no error (i.e. `nil`).
 //
 //   actualObj, err := SomeFunction()
 //   if a.NoError(err) {
 // 	   assert.Equal(t, actualObj, expectedObj)
 //   }
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) NoError(err error, msgAndArgs ...interface{}) bool {
 	return NoError(a.t, err, msgAndArgs...)
 }
 // NotContains asserts that the specified string, list(array, slice...) or map does NOT contain the
 // specified substring or element.
 //
 //    a.NotContains("Hello World", "Earth", "But 'Hello World' does NOT contain 'Earth'")
 //    a.NotContains(["Hello", "World"], "Earth", "But ['Hello', 'World'] does NOT contain 'Earth'")
 //    a.NotContains({"Hello": "World"}, "Earth", "But {'Hello': 'World'} does NOT contain 'Earth'")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) NotContains(s interface{}, contains interface{}, msgAndArgs ...interface{}) bool {
 	return NotContains(a.t, s, contains, msgAndArgs...)
 }
 // NotEmpty asserts that the specified object is NOT empty.  I.e. not nil, "", false, 0 or either
 // a slice or a channel with len == 0.
 //
 //  if a.NotEmpty(obj) {
 //    assert.Equal(t, "two", obj[1])
 //  }
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) NotEmpty(object interface{}, msgAndArgs ...interface{}) bool {
 	return NotEmpty(a.t, object, msgAndArgs...)
 }
 // NotEqual asserts that the specified values are NOT equal.
 //
 //    a.NotEqual(obj1, obj2, "two objects shouldn't be equal")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) NotEqual(expected interface{}, actual interface{}, msgAndArgs ...interface{}) bool {
 	return NotEqual(a.t, expected, actual, msgAndArgs...)
 }
 // NotNil asserts that the specified object is not nil.
 //
 //    a.NotNil(err, "err should be something")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) NotNil(object interface{}, msgAndArgs ...interface{}) bool {
 	return NotNil(a.t, object, msgAndArgs...)
 }
 // NotPanics asserts that the code inside the specified PanicTestFunc does NOT panic.
 //
 //   a.NotPanics(func(){
 //     RemainCalm()
 //   }, "Calling RemainCalm() should NOT panic")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) NotPanics(f PanicTestFunc, msgAndArgs ...interface{}) bool {
 	return NotPanics(a.t, f, msgAndArgs...)
 }
 // NotRegexp asserts that a specified regexp does not match a string.
 //
 //  a.NotRegexp(regexp.MustCompile("starts"), "it's starting")
 //  a.NotRegexp("^start", "it's not starting")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) NotRegexp(rx interface{}, str interface{}, msgAndArgs ...interface{}) bool {
 	return NotRegexp(a.t, rx, str, msgAndArgs...)
 }
 // NotZero asserts that i is not the zero value for its type and returns the truth.
 func (a *Assertions) NotZero(i interface{}, msgAndArgs ...interface{}) bool {
 	return NotZero(a.t, i, msgAndArgs...)
 }
 // Panics asserts that the code inside the specified PanicTestFunc panics.
 //
 //   a.Panics(func(){
 //     GoCrazy()
 //   }, "Calling GoCrazy() should panic")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Panics(f PanicTestFunc, msgAndArgs ...interface{}) bool {
 	return Panics(a.t, f, msgAndArgs...)
 }
 // Regexp asserts that a specified regexp matches a string.
 //
 //  a.Regexp(regexp.MustCompile("start"), "it's starting")
 //  a.Regexp("start...$", "it's not starting")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) Regexp(rx interface{}, str interface{}, msgAndArgs ...interface{}) bool {
 	return Regexp(a.t, rx, str, msgAndArgs...)
 }
 // True asserts that the specified value is true.
 //
 //    a.True(myBool, "myBool should be true")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) True(value bool, msgAndArgs ...interface{}) bool {
 	return True(a.t, value, msgAndArgs...)
 }
 // WithinDuration asserts that the two times are within duration delta of each other.
 //
 //   a.WithinDuration(time.Now(), time.Now(), 10*time.Second, "The difference should not be more than 10s")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func (a *Assertions) WithinDuration(expected time.Time, actual time.Time, delta time.Duration, msgAndArgs ...interface{}) bool {
 	return WithinDuration(a.t, expected, actual, delta, msgAndArgs...)
 }
 // Zero asserts that i is the zero value for its type and returns the truth.
 func (a *Assertions) Zero(i interface{}, msgAndArgs ...interface{}) bool {
 	return Zero(a.t, i, msgAndArgs...)
 }
--- a/vendor/github.com/stretchr/testify/assert/assertion_forward.go.tmpl
+++ b/vendor/github.com/stretchr/testify/assert/assertion_forward.go.tmpl
@ -0,0 +1,4 @@
 {{.CommentWithoutT "a"}}
 func (a *Assertions) {{.DocInfo.Name}}({{.Params}}) bool {
 	return {{.DocInfo.Name}}(a.t, {{.ForwardedParams}})
 }
--- a/vendor/github.com/stretchr/testify/assert/assertions.go
+++ b/vendor/github.com/stretchr/testify/assert/assertions.go
--- a/vendor/github.com/stretchr/testify/assert/doc.go
+++ b/vendor/github.com/stretchr/testify/assert/doc.go
@ -0,0 +1,45 @@
 // Package assert provides a set of comprehensive testing tools for use with the normal Go testing system.
 //
 // Example Usage
 //
 // The following is a complete example using assert in a standard test function:
 //    import (
 //      "testing"
 //      "github.com/stretchr/testify/assert"
 //    )
 //
 //    func TestSomething(t *testing.T) {
 //
 //      var a string = "Hello"
 //      var b string = "Hello"
 //
 //      assert.Equal(t, a, b, "The two words should be the same.")
 //
 //    }
 //
 // if you assert many times, use the format below:
 //
 //    import (
 //      "testing"
 //      "github.com/stretchr/testify/assert"
 //    )
 //
 //    func TestSomething(t *testing.T) {
 //      assert := assert.New(t)
 //
 //      var a string = "Hello"
 //      var b string = "Hello"
 //
 //      assert.Equal(a, b, "The two words should be the same.")
 //    }
 //
 // Assertions
 //
 // Assertions allow you to easily write test code, and are global funcs in the `assert` package.
 // All assertion functions take, as the first argument, the `*testing.T` object provided by the
 // testing framework. This allows the assertion funcs to write the failings and other details to
 // the correct place.
 //
 // Every assertion function also takes an optional string message as the final argument,
 // allowing custom error messages to be appended to the message the assertion method outputs.
 package assert
--- a/vendor/github.com/stretchr/testify/assert/errors.go
+++ b/vendor/github.com/stretchr/testify/assert/errors.go
@ -0,0 +1,10 @@
 package assert
 import (
 	"errors"
 )
 // AnError is an error instance useful for testing.  If the code does not care
 // about error specifics, and only needs to return the error for example, this
 // error should be used to make the test code more readable.
 var AnError = errors.New("assert.AnError general error for testing")
--- a/vendor/github.com/stretchr/testify/assert/forward_assertions.go
+++ b/vendor/github.com/stretchr/testify/assert/forward_assertions.go
@ -0,0 +1,16 @@
 package assert
 // Assertions provides assertion methods around the
 // TestingT interface.
 type Assertions struct {
 	t TestingT
 }
 // New makes a new Assertions object for the specified TestingT.
 func New(t TestingT) *Assertions {
 	return &Assertions{
 		t: t,
 	}
 }
 //go:generate go run ../_codegen/main.go -output-package=assert -template=assertion_forward.go.tmpl
--- a/vendor/github.com/stretchr/testify/assert/http_assertions.go
+++ b/vendor/github.com/stretchr/testify/assert/http_assertions.go
@ -0,0 +1,106 @@
 package assert
 import (
 	"fmt"
 	"net/http"
 	"net/http/httptest"
 	"net/url"
 	"strings"
 )
 // httpCode is a helper that returns HTTP code of the response. It returns -1
 // if building a new request fails.
 func httpCode(handler http.HandlerFunc, method, url string, values url.Values) int {
 	w := httptest.NewRecorder()
 	req, err := http.NewRequest(method, url+"?"+values.Encode(), nil)
 	if err != nil {
 		return -1
 	}
 	handler(w, req)
 	return w.Code
 }
 // HTTPSuccess asserts that a specified handler returns a success status code.
 //
 //  assert.HTTPSuccess(t, myHandler, "POST", "http://www.google.com", nil)
 //
 // Returns whether the assertion was successful (true) or not (false).
 func HTTPSuccess(t TestingT, handler http.HandlerFunc, method, url string, values url.Values) bool {
 	code := httpCode(handler, method, url, values)
 	if code == -1 {
 		return false
 	}
 	return code >= http.StatusOK && code <= http.StatusPartialContent
 }
 // HTTPRedirect asserts that a specified handler returns a redirect status code.
 //
 //  assert.HTTPRedirect(t, myHandler, "GET", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
 func HTTPRedirect(t TestingT, handler http.HandlerFunc, method, url string, values url.Values) bool {
 	code := httpCode(handler, method, url, values)
 	if code == -1 {
 		return false
 	}
 	return code >= http.StatusMultipleChoices && code <= http.StatusTemporaryRedirect
 }
 // HTTPError asserts that a specified handler returns an error status code.
 //
 //  assert.HTTPError(t, myHandler, "POST", "/a/b/c", url.Values{"a": []string{"b", "c"}}
 //
 // Returns whether the assertion was successful (true) or not (false).
 func HTTPError(t TestingT, handler http.HandlerFunc, method, url string, values url.Values) bool {
 	code := httpCode(handler, method, url, values)
 	if code == -1 {
 		return false
 	}
 	return code >= http.StatusBadRequest
 }
 // HTTPBody is a helper that returns HTTP body of the response. It returns
 // empty string if building a new request fails.
 func HTTPBody(handler http.HandlerFunc, method, url string, values url.Values) string {
 	w := httptest.NewRecorder()
 	req, err := http.NewRequest(method, url+"?"+values.Encode(), nil)
 	if err != nil {
 		return ""
 	}
 	handler(w, req)
 	return w.Body.String()
 }
 // HTTPBodyContains asserts that a specified handler returns a
 // body that contains a string.
 //
 //  assert.HTTPBodyContains(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func HTTPBodyContains(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, str interface{}) bool {
 	body := HTTPBody(handler, method, url, values)
 	contains := strings.Contains(body, fmt.Sprint(str))
 	if !contains {
 		Fail(t, fmt.Sprintf("Expected response body for \"%s\" to contain \"%s\" but found \"%s\"", url+"?"+values.Encode(), str, body))
 	}
 	return contains
 }
 // HTTPBodyNotContains asserts that a specified handler returns a
 // body that does not contain a string.
 //
 //  assert.HTTPBodyNotContains(t, myHandler, "www.google.com", nil, "I'm Feeling Lucky")
 //
 // Returns whether the assertion was successful (true) or not (false).
 func HTTPBodyNotContains(t TestingT, handler http.HandlerFunc, method, url string, values url.Values, str interface{}) bool {
 	body := HTTPBody(handler, method, url, values)
 	contains := strings.Contains(body, fmt.Sprint(str))
 	if contains {
 		Fail(t, fmt.Sprintf("Expected response body for \"%s\" to NOT contain \"%s\" but found \"%s\"", url+"?"+values.Encode(), str, body))
 	}
 	return !contains
 }
--- a/vendor/vendor.json
+++ b/vendor/vendor.json
@ -50,6 +50,12 @@
 			"revision": "0a0a04ccf7a5e6b93d9a5507701635330cf4579c",
 			"revisionTime": "2016-11-07T15:06:50Z"
 		},
 		{
 			"checksumSHA1": "Lf3uUXTkKK5DJ37BxQvxO1Fq+K8=",
 			"path": "github.com/davecgh/go-spew/spew",
 			"revision": "976c720a22c8eb4eb6a0b4348ad85ad12491a506",
 			"revisionTime": "2016-09-25T22:06:09Z"
 		},
 		{
 			"checksumSHA1": "qM/kf31cT2cxjtHxdzbu8q8jPq0=",
 			"path": "github.com/go-macaron/binding",
@ -248,6 +254,12 @@
 			"revision": "891127d8d1b52734debe1b3c3d7e747502b6c366",
 			"revisionTime": "2016-07-24T20:39:20Z"
 		},
 		{
 			"checksumSHA1": "zKKp5SZ3d3ycKe4EKMNT0BqAWBw=",
 			"path": "github.com/pmezard/go-difflib/difflib",
 			"revision": "976c720a22c8eb4eb6a0b4348ad85ad12491a506",
 			"revisionTime": "2016-09-25T22:06:09Z"
 		},
 		{
 			"checksumSHA1": "c7jHQZk5ZEsFR9EXsWJXkszPBZA=",
 			"path": "github.com/russross/blackfriday",
@ -308,6 +320,12 @@
 			"revision": "019319c870f8f1d61dc9c34291abff5cd128b6e8",
 			"revisionTime": "2016-11-03T17:15:00Z"
 		},
 		{
 			"checksumSHA1": "Q2V7Zs3diLmLfmfbiuLpSxETSuY=",
 			"path": "github.com/stretchr/testify/assert",
 			"revision": "976c720a22c8eb4eb6a0b4348ad85ad12491a506",
 			"revisionTime": "2016-09-25T22:06:09Z"
 		},
 		{
 			"checksumSHA1": "ToTZYDqlvtuFsetAq5FeCwUxp0E=",
 			"path": "github.com/urfave/cli",