update to polymer js 0.5.1

pkg/polymer/test/attr_mustache_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:html';
 import 'package:polymer/polymer.dart';
 import 'package:unittest/unittest.dart';
 import 'package:unittest/html_config.dart';
 import 'package:template_binding/template_binding.dart';
 
 @CustomTag('x-target')
 class XTarget extends PolymerElement {
   XTarget.created() : super.created();
 
   final Completer _found = new Completer();
   Future get foundSrc => _found.future;
 
   // force an mdv binding
   bind(name, value, {oneTime: false}) =>
       nodeBindFallback(this).bind(name, value, oneTime: oneTime);
 
-  inserted() {
+  attached() {
     testSrcForMustache();
   }
 
   attributeChanged(name, oldValue, newValue) {
     testSrcForMustache();
     if (attributes[name] == '../testSource') {
       _found.complete();
     }
   }
 
@@ skipping 14 matching lines @@
   useHtmlConfiguration();
 
   setUp(() => Polymer.onReady);
 
   test('mustache attributes', () {
     final xtest = document.querySelector('#test');
     final xtarget = xtest.shadowRoot.querySelector('#target');
     return xtarget.foundSrc;
   });
 });