Roll Observatory packages and add a roll script

packages/polymer/lib/transformer.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.
 
 /// Transfomer used for pub-serve and pub-deploy.
 library polymer.transformer;
 
 import 'package:barback/barback.dart';
 import 'package:web_components/transformer.dart' as web_components;
 import 'package:observe/transformer.dart';
@@ skipping 185 matching lines @@
   }
   /// Must happen last, rewrites
   /// <script type="application/dart" _was_test></script> tags back to
   /// <link rel="x-dart-test"> tags.
   phases.add(
       [new web_components.RewriteScriptToXDartTest(options.entryPoints)]);
   return phases;
 }
 
 final RegExp _PACKAGE_PATH_REGEX = new RegExp(r'packages\/([^\/]+)\/(.*)');