Add @jsify annotation. Support automatically proxying Lists and Maps to Dart in Proxies. Support co…

lib/src/static.dart

 library js.static;
 
 // This is the public interface of js.dart
 // The exports must match those in static.dart
-export 'package:js/src/js_impl.dart';
+export 'package:js/src/js_impl.dart' show JsInterface, JsGlobal, toJs, toDart,
+    registerJsConstructorForType, registerFactoryForJsConstructor;
 export 'dart:js' show JsObject;
 export 'package:js/src/metadata.dart';
 
 void initializeJavaScript() {
   throw new StateError("Non-transformed initialization is being called. "
       "You are using js.dart in deployed mode, but you probably haven't "
       "configured the initializer transformer, or you are calling "
       "initializeJavaScript() somewhere other than main(). "
       "Try adding '- js/initializer' to your applications transformers.");
 }