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/name.go

@@ -0,0 +1,61 @@
+// 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 (
+	"encoding/base64"
+	"encoding/hex"
+	"path"
+	"strings"
+)
+
+// Name applies name hashing if required. It returns the original
+// name for NoHash and NameUnchanged and returns the mangledName
+// otherwise.
+func (asset *binAsset) Name() string {
+	if asset.Hash == nil || asset.opts.HashFormat == NameUnchanged {
+		return asset.File.Name()
+	} else if asset.mangledName != "" {
+		return asset.mangledName
+	}
+
+	var enc string
+	switch asset.opts.HashEncoding {
+	case HexHash:
+		enc = hex.EncodeToString(asset.Hash)
+	case Base32Hash:
+		enc = base32Enc.EncodeToString(asset.Hash)
+	case Base64Hash:
+		enc = base64.RawURLEncoding.EncodeToString(asset.Hash)
+	default:
+		panic("unreachable")
+	}
+
+	l := asset.opts.HashLength
+	if l == 0 {
+		l = 16
+	}
+
+	if l < uint(len(enc)) {
+		enc = enc[:l]
+	}
+
+	dir, file := path.Split(asset.File.Name())
+	ext := path.Ext(file)
+
+	switch asset.opts.HashFormat {
+	case DirHash:
+		asset.mangledName = path.Join(dir, enc, file)
+	case NameHashSuffix:
+		file = strings.TrimSuffix(file, ext)
+		asset.mangledName = path.Join(dir, file+"-"+enc+ext)
+	case HashWithExt:
+		asset.mangledName = path.Join(dir, enc+ext)
+	default:
+		panic("unreachable")
+	}
+
+	return asset.mangledName
+}