update polymer, nodebind, and templatebinding

pkg/template_binding/lib/src/select_element.dart

Index: pkg/template_binding/lib/src/select_element.dart
diff --git a/pkg/template_binding/lib/src/select_element.dart b/pkg/template_binding/lib/src/select_element.dart
index f205a15cf20a85cf254d2d0e01220fd0184c510a..c936d40486519406c0709a5f99338872b876c7b3 100644
--- a/pkg/template_binding/lib/src/select_element.dart
+++ b/pkg/template_binding/lib/src/select_element.dart
@@ -24,7 +24,7 @@ class _SelectElementExtension extends _ElementExtension {
       return null;
     }
 
-    _self.unbind(name);
-    return bindings[name] = new _InputBinding(_node, value, name);
+    // Option update events may need to access select bindings.
+    return _updateBindings(name, new _InputBinding(_node, value, name));
   }
 }