Add licenses and remove third party libraries

src/Layout.js

@@ -1,4 +1,11 @@
-/** @nolint */
+/**
+ * Copyright (c) 2014, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
 
 var computeLayout = (function() {