Integrate public as bindata optionally (#293)

* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix

vendor/github.com/pingcap/tidb/util/bytes/bytes.go

@@ -0,0 +1,6 @@
+package bytes
+
+// CloneBytes returns a deep copy of slice b.
+func CloneBytes(b []byte) []byte {
+	return append([]byte(nil), b...)
+}