Move observe to observe package

pkg/polymer/lib/polymer.dart

 // Copyright (c) 2012, 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.
 
 /**
  * This library exports all of the commonly used functions and types for
  * building UI's.
  *
  * See this article for more information:
  * <http://www.dartlang.org/articles/dart-web-components/>.
  */
 library polymer;
 
 import 'dart:async';
 import 'dart:mirrors';
 
 import 'package:mdv/mdv.dart' as mdv;
 import 'package:observe/src/microtask.dart';
 import 'package:path/path.dart' as path;
 import 'polymer_element.dart' show registerPolymerElement;
 
 export 'package:custom_element/custom_element.dart';
 export 'package:observe/observe.dart';
+export 'package:observe/observe_html.dart';
 export 'package:observe/src/microtask.dart';
 
-export 'observe.dart';
-export 'observe_html.dart';
 export 'polymer_element.dart';
 export 'safe_html.dart';
 
 
 /** Annotation used to automatically register polymer elements. */
 class CustomTag {
   final String tagName;
   const CustomTag(this.tagName);
 }
 
@@ skipping 102 matching lines @@
     print("warning: methods marked with @initMethod should take no "
         "arguments, ${method.simpleName} expects some.");
     return;
   }
   obj.invoke(method.simpleName, const []);
 }
 
 class _InitMethodAnnotation {
   const _InitMethodAnnotation();
 }