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

lib/polymer_element.dart

Index: lib/polymer_element.dart
diff --git a/lib/polymer_element.dart b/lib/polymer_element.dart
index 8f06f501a347bdff36a540cd9ffeaf20f0567f54..d909bba6e6e80d178d1ca552daaca737471612b6 100644
--- a/lib/polymer_element.dart
+++ b/lib/polymer_element.dart
@@ -136,11 +136,8 @@ abstract class PolymerElement extends CustomElement with _EventsMixin {
 
       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));
     }
   }