update polymer, nodebind, and templatebinding

pkg/template_binding/lib/src/instance_binding_map.dart

Index: pkg/template_binding/lib/src/instance_binding_map.dart
diff --git a/pkg/template_binding/lib/src/instance_binding_map.dart b/pkg/template_binding/lib/src/instance_binding_map.dart
index ad34b6e6a5f29a9ab8c61f3cfaa082117f060359..bc4105ab4d4d16e3cd2a7e36f637fdb6538b71ae 100644
--- a/pkg/template_binding/lib/src/instance_binding_map.dart
+++ b/pkg/template_binding/lib/src/instance_binding_map.dart
@@ -71,3 +71,17 @@ Node _cloneAndBindInstance(Node node, Node parent, Document stagingDocument,
   _processBindings(clone, bindings, model, instanceBindings);
   return clone;
 }
+
+// TODO(rafaelw): Setup a MutationObserver on content which clears the expando
+// so that bindingMaps regenerate when template.content changes.
+_getInstanceBindingMap(DocumentFragment content, BindingDelegate delegate) {
+  if (delegate == null) delegate = BindingDelegate._DEFAULT;
+
+  if (delegate._bindingMaps == null) delegate._bindingMaps = new Expando();
+  var map = delegate._bindingMaps[content];
+  if (map == null) {
+    map = _createInstanceBindingMap(content, delegate);
+    delegate._bindingMaps[content] = map;
+  }
+  return map;
+}