Restore x-webkit-deflate-frame extension removed at r751.

The extension needs to be implemented for testing the blink implementation.

Review URL: https://codereview.appspot.com/8902045

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@760 4ff78f4a-9131-11de-b045-6380ec9940d4
Define a constant for sleep time for warming up the server.

Release note: n/a (test only change)

Review URL: https://codereview.appspot.com/8782044

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@761 4ff78f4a-9131-11de-b045-6380ec9940d4
Add tests on the extension processor registry

Release note: n/a (test only change)

Review URL: https://codereview.appspot.com/8782045

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@762 4ff78f4a-9131-11de-b045-6380ec9940d4