update to polymer js 0.5.1

pkg/template_binding/lib/js/microtask.js

 /*
  * Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
  * This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
  * The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
  * The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
  * Code distributed by Google as part of the polymer project is also
  * subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
  */
 
 (function(scope) {
@@ skipping 11 matching lines @@
   while (callbacks.length) {
     callbacks.shift()();
   }
 }
 
 new (window.MutationObserver || JsMutationObserver)(atEndOfMicrotask)
   .observe(twiddle, {characterData: true})
   ;
 
 // exports
+scope.endOfMicrotask = endOfMicrotask;
+// bc 
+Platform.endOfMicrotask = endOfMicrotask;
 
-scope.endOfMicrotask = endOfMicrotask;
+})(Polymer);
 
-})(Platform);
-