Updated kitchen sink test with per-widget data binding extension.

Sorry for the EOL thing (diff of atBindingExtension.js), the actual change is addition of [4 lines to prevent data binding extension from being applied for ones that were done already](https://github.com/asudoh/dojox_mvc/blob/bdb4d18e38721e6062aaa493c0549d8ecb4501bb/atBindingExtension.js#L16-L19).