add initWebComponents

lib/init.dart

Index: lib/init.dart
diff --git a/test/foo/bar.dart b/lib/init.dart
similarity index 65%
copy from test/foo/bar.dart
copy to lib/init.dart
index 67845503e9d6cd6a39ba6ed5499b7239bdb827e5..1ebb1413f9023f4113e1c1616511af98477037f5 100644
--- a/test/foo/bar.dart
+++ b/lib/init.dart
@@ -1,7 +1,9 @@
 // Copyright (c) 2015, 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.
-@HtmlImport('bar.html')
-library web_components.test.foo.bar;
+library web_components.init;
 
-import 'package:web_components/web_components.dart';
+import 'dart:async';
+import 'src/init.dart';
+
+Future main() => initWebComponents();