Bypass VRaptor filter in WebSocket requests.
1. Moving the Websocket request identification to an specific method.
2. Creation of a unit test for the Websocket request bypass mechanism.
Moving comments within the method to the method's javadoc.
Avoiding a second call to request.getHeader()
Refactoring the test to reflect the expected behaviour
Merge pull request #891 from marcioferlan/master

Bypass VRaptor filter in WebSocket requests.