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

lib/custom_element.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.
 
 library polymer.custom_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'package:mdv/mdv.dart' as mdv;
 import 'package:meta/meta.dart';
@@ skipping 171 matching lines @@
   get model => host.model;
 
   void set model(newModel) {
     host.model = newModel;
   }
 
   get templateInstance => host.templateInstance;
   get isTemplate => host.isTemplate;
   get ref => host.ref;
   get content => host.content;
-  DocumentFragment createInstance(model, String syntax) =>
-      host.createInstance(model, syntax);
+  DocumentFragment createInstance(model, BindingDelegate delegate) =>
+      host.createInstance(model, delegate);
   void bind(String name, model, String path) => host.bind(name, model, path);
   void unbind(String name) => host.unbind(name);
   void unbindAll() => host.unbindAll();
 
   // TODO(jmesserly): this forwarding is temporary until Dart supports
   // subclassing Elements.
   // TODO(jmesserly): we were missing the setter for title, are other things
   // missing setters?
 
   List<Node> get nodes => host.nodes;
@@ skipping 473 matching lines @@
 /**
  * DEPRECATED: this has no effect. Shadow DOM should always be used with custom
  * elements.
  *
  * Set this to true to use native Shadow DOM if it is supported.
  * Note that this will change behavior of [WebComponent] APIs for tree
  * traversal.
  */
 @deprecated
 bool useShadowDom = false;