Bypass VRaptor filter in WebSocket requests.

When you try to open a WebSocket connection to a @ServerEndpoint component in your application, the current implementation of the VRaptor filter prevents it from completing.

This fix allows WebSocket requests to bypass the VRaptor filter, hence, succeeding to establish the connection.
The first verify() works, but the second one does not. I get the following exception:
```
org.mockito.exceptions.misusing.NotAMockException: 
Argument passed to verify() is of type MockStaticContentHandler$Proxy$_$$_WeldClientProxy and is not a mock!
Make sure you place the parenthesis correctly!
See the examples of correct verifications:
    verify(mock).someMethod();
    verify(mock, times(10)).someMethod();
    verify(mock, atLeastOnce()).someMethod();
	at br.com.caelum.vraptor.VRaptorTest.shouldBypassWebsocketRequests(VRaptorTest.java:79)
[...]
```