Revert "Changes to Hybi13Socket" due to issues with common frames

This reverts commit bd1d7b2a87e09ddf22cb3c50e3f4d4d840c51447.

There are some common frames that are not understood by current code, which at least on my tests with Chrome, get sent after a few seconds. Without this pull this will cause immediately websocket to be closed, which is not what is wanted. We want to be able to just skip the unknown frames and continue with the ones we know about. In the future we would want to implement support for those frames as well.