Add heredoc and go-wordwrap dependencies

vendor/github.com/MakeNowJust/heredoc/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2014 TSUYUSATO Kitsune
+
+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.

vendor/github.com/MakeNowJust/heredoc/README.md

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+#heredoc [![Build Status](https://drone.io/github.com/MakeNowJust/heredoc/status.png)](https://drone.io/github.com/MakeNowJust/heredoc/latest) [![Go Walker](http://gowalker.org/api/v1/badge)](https://gowalker.org/github.com/MakeNowJust/heredoc)
+
+##About
+
+Package heredoc provides the here-document with keeping indent.
+
+##Install
+
+```console
+$ go get github.com/MakeNowJust/heredoc
+```
+
+##Import
+
+```go
+// usual
+import "github.com/MakeNowJust/heredoc"
+// shortcuts
+import . "github.com/MakeNowJust/heredoc/dot"
+```
+
+##Example
+
+```go
+package main
+
+import (
+	"fmt"
+	. "github.com/MakeNowJust/heredoc/dot"
+)
+
+func main() {
+	fmt.Println(D(`
+		Lorem ipsum dolor sit amet, consectetur adipisicing elit,
+		sed do eiusmod tempor incididunt ut labore et dolore magna
+		aliqua. Ut enim ad minim veniam, ...
+	`))
+	// Output:
+	// Lorem ipsum dolor sit amet, consectetur adipisicing elit,
+	// sed do eiusmod tempor incididunt ut labore et dolore magna
+	// aliqua. Ut enim ad minim veniam, ...
+	//
+}
+```
+
+##API Document
+
+ - [Go Walker - github.com/MakeNowJust/heredoc](https://gowalker.org/github.com/MakeNowJust/heredoc)
+ - [Go Walker - github.com/MakeNowJust/heredoc/dot](https://gowalker.org/github.com/MakeNowJust/heredoc/dot)
+
+##License
+
+This software is released under the MIT License, see LICENSE.

vendor/github.com/MakeNowJust/heredoc/heredoc.go

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+// Copyright (c) 2014 TSUYUSATO Kitsune
+// This software is released under the MIT License.
+// http://opensource.org/licenses/mit-license.php
+
+// Package heredoc provides the here-document with keeping indent.
+//
+// Golang supports raw-string syntax.
+//     doc := `
+//     	Foo
+//     	Bar
+//     `
+// But raw-string cannot recognize indent. Thus such content is indented string, equivalent to
+//     "\n\tFoo\n\tBar\n"
+// I dont't want this!
+//
+// However this problem is solved by package heredoc.
+//     doc := heredoc.Doc(`
+//     	Foo
+//     	Bar
+//     `)
+// It is equivalent to
+//     "Foo\nBar\n"
+package heredoc
+
+import (
+	"fmt"
+	"strings"
+	"unicode"
+)
+
+// heredoc.Doc retutns unindented string as here-document.
+//
+// Process of making here-document:
+//     1. Find most little indent size. (Skip empty lines)
+//     2. Remove this indents of lines.
+func Doc(raw string) string {
+	skipFirstLine := false
+	if raw[0] == '\n' {
+		raw = raw[1:]
+	} else {
+		skipFirstLine = true
+	}
+
+	minIndentSize := int(^uint(0) >> 1) // Max value of type int
+	lines := strings.Split(raw, "\n")
+
+	// 1.
+	for i, line := range lines {
+		if i == 0 && skipFirstLine {
+			continue
+		}
+
+		indentSize := 0
+		for _, r := range []rune(line) {
+			if unicode.IsSpace(r) {
+				indentSize += 1
+			} else {
+				break
+			}
+		}
+
+		if len(line) == indentSize {
+			if i == len(lines)-1 && indentSize < minIndentSize {
+				lines[i] = ""
+			}
+		} else if indentSize < minIndentSize {
+			minIndentSize = indentSize
+		}
+	}
+
+	// 2.
+	for i, line := range lines {
+		if i == 0 && skipFirstLine {
+			continue
+		}
+
+		if len(lines[i]) >= minIndentSize {
+			lines[i] = line[minIndentSize:]
+		}
+	}
+
+	return strings.Join(lines, "\n")
+}
+
+// heredoc.Docf returns unindented and formatted string as here-document.
+// This format is same with package fmt's format.
+func Docf(raw string, args ...interface{}) string {
+	return fmt.Sprintf(Doc(raw), args...)
+}