Introduce boot.js: this finally makes it possible to load and run Todomvc

build.dart

 #!/usr/bin/env 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.
 
 /** Build logic that lets the Dart editor build examples in the background. */
 library build;
 import 'package:polymer/component_build.dart';
 import 'dart:io';
 
 void main() {
-  build(new Options().arguments, [
+  var args = new Options().arguments.toList();
+  args.addAll(['--', '--no-css']);
+  build(args, [
     'example/component/news/web/index.html',
     'example/todomvc/web/index.html']);
 }