WIP: Seamless Angular Server Side API support

 - Add several controller feature traits for Angular apps
 - Angular XSRF protection (XSRF-TOKEN cookie and X-XSRF-TOKEN header)
 - Angular friendly JSON keys (camelCase)
 - Merge JSON request body to params
 - Add Angular example code and test

TODO

 - Mock controller should work with JSON request body
 - Integration test support
 - Improve error response?