Add framer as abstract interface to build/parse websocket frame.

[GoogleCodeExporter]

Purpose of code changes on this branch:
hybi new protocol changes websocket framing protocol.
to dispatch framing protocol based on handshake, we'll provide 
request.ws_framer to call send_message or receive_message, rather than using 
msgutil directly.

When reviewing my code changes, please focus on:

After the review, I'll merge this branch into:
/trunk

Original issue reported on code.google.com by ukai@chromium.org on 18 Oct 2010 at 8:39

[GoogleCodeExporter]

Original comment by ukai@chromium.org on 11 Nov 2010 at 6:34

• Changed state: Fixed