:polemico: Removing ContainerProvider

This class is an inheritance of VRaptor 3 that doesn't make sense on VRaptor 4. We're too coupled to CDI to even think of using another container implementation.

So this class is removed.

Also changed VRaptorInitialized to hold the servletContext, so we can stop firing another event.

BONUS: Removed `NewRequest` in order to fire just `RequestInfo`