Refactor repository layout and convert build system to Mage.

This commit implements a massive refactor of the repository, and
moves the build system over to use Mage (magefile.org) which should
allow seamless building across multiple platforms.

tools/vendor/github.com/tmthrgd/go-bindata/header.go

@@ -0,0 +1,73 @@
+// Copyright 2017 Tom Thorogood. All rights reserved.
+// Use of this source code is governed by a Modified
+// BSD License that can be found in the LICENSE file.
+
+package bindata
+
+import (
+	"path/filepath"
+	"strings"
+	"text/template"
+	"unicode"
+)
+
+func init() {
+	template.Must(baseTemplate.New("header").Funcs(template.FuncMap{
+		"trimright": func(s string) string {
+			return strings.TrimRightFunc(s, unicode.IsSpace)
+		},
+		"toslash": filepath.ToSlash,
+	}).Parse(`{{- /* This makes e.g. Github ignore diffs in generated files. */ -}}
+// Code generated by go-bindata. DO NOT EDIT.
+{{if $.Dev -}}
+	//  debug: dev
+{{else if $.Debug -}}
+	//  debug: true
+{{end -}}
+{{- if $.MemCopy -}}
+	//  memcopy: true
+{{end -}}
+{{- if $.Compress -}}
+	//  compress: true
+{{end -}}
+{{- if and $.Compress $.DecompressOnce -}}
+	//  decompress: once
+{{end -}}
+{{- if $.Metadata -}}
+	//  metadata: true
+{{end -}}
+{{- if $.Mode -}}
+	//  mode: {{printf "%04o" $.Mode}}
+{{end -}}
+{{- if $.ModTime -}}
+	//  modtime: {{$.ModTime}}
+{{end -}}
+{{- if $.AssetDir -}}
+	//  asset-dir: true
+{{end -}}
+{{- if $.Restore -}}
+	//  restore: true
+{{end -}}
+{{- if $.Hash -}}
+{{- if $.HashFormat -}}
+	//  hash-format: {{$.HashFormat}}
+{{else -}}
+	//  hash-format: unchanged
+{{end -}}
+{{- if and $.HashFormat $.HashLength (ne $.HashLength 16) -}}
+	//  hash-length: {{$.HashLength}}
+{{end -}}
+{{- if and $.HashFormat $.HashEncoding -}}
+	//  hash-encoding: {{$.HashEncoding}}
+{{end -}}
+{{- end -}}
+// sources:
+{{range .Assets -}}
+	//  {{toslash (trimright .Path)}}
+{{end}}
+{{if $.Tags -}} // +build {{$.Tags}}
+
+{{end -}}
+
+package {{$.Package}}`))
+}