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
Merge pull request #163 from skinny-framework/feature/angular

Seamless Angular Server Side API support