Add note about methods for setting c2s parameter.

c2s methods are just for negotiation testing.

Release note: n/a (comment only)

BUG=none
TEST=run_all.py
Review URL: https://codereview.appspot.com/8589045

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@749 4ff78f4a-9131-11de-b045-6380ec9940d4
Factor out framing part of deflate method of permessage-compress extension into a separate class.

It's going to be used for permessage-deflate implementation.

Release note: n/a (no behavior change)
Review URL: https://codereview.appspot.com/8411044

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@750 4ff78f4a-9131-11de-b045-6380ec9940d4