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

lib/polymer_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.polymer_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'dart:mirrors';
 
+import 'package:custom_element/custom_element.dart';
 import 'package:mdv/mdv.dart' as mdv;
 import 'package:observe/observe.dart';
 
-import 'custom_element.dart';
 import 'observe.dart';
 import 'src/utils_observe.dart' show toCamelCase, toHyphenedName;
 
 /**
  * Registers a [PolymerElement]. This is similar to [registerCustomElement]
  * but it is designed to work with the `<element>` element and adds additional
  * features.
  */
 void registerPolymerElement(String localName, PolymerElement create()) {
   registerCustomElement(localName, () => create().._initialize(localName));
@@ skipping 104 matching lines @@
 
       root.applyAuthorStyles = applyAuthorStyles;
       root.resetStyleInheritance = resetStyleInheritance;
 
       var templateNode = declaration.children.firstWhere(
           (n) => n.localName == 'template', orElse: () => null);
       if (templateNode == null) return;
 
       root.nodes.add(cloneTemplate(templateNode.content));
       // TODO(sigmund): use fancy-syntax as the default.
-      var syntax = templateNode.attributes['syntax'];
-
       // TODO(sigmund,jmesserly): mdv.bindModel should be async internally
-      Timer.run(() => mdv.bindModel(root, this,
-          syntax != null ? TemplateElement.syntax[syntax] : null));
+      Timer.run(() => mdv.bindModel(root, this));
     }
   }
 
   void bind(String name, model, String path) {
     var propObserver = _publishedAttrs[name];
     if (propObserver != null) {
       unbind(name);
 
       _bindings[name] = new PathObserver(model, path).bindSync((value) {
         propObserver.value = value;
@@ skipping 357 matching lines @@
   'onKeyMessage': MediaElement.keyMessageEvent,
   'onNeedKey': MediaElement.needKeyEvent,
   'onWebGlContextLost': CanvasElement.webGlContextLostEvent,
   'onWebGlContextRestored': CanvasElement.webGlContextRestoredEvent,
   'onPointerLockChange': Document.pointerLockChangeEvent,
   'onPointerLockError': Document.pointerLockErrorEvent,
   'onReadyStateChange': Document.readyStateChangeEvent,
   'onSelectionChange': Document.selectionChangeEvent,
   'onSecurityPolicyViolation': Document.securityPolicyViolationEvent,
 };