Rename parameter names to follow the permessage-deflate spec change.

Replace s2c_ and c2s_ with server_ and client_ respectively.

R=tyoshino@chromium.org

Review URL: https://codereview.appspot.com/14664044

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@787 4ff78f4a-9131-11de-b045-6380ec9940d4