Add a handler which rejects all extensions.
Review URL: https://codereview.appspot.com/7015043

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@723 4ff78f4a-9131-11de-b045-6380ec9940d4
Simple benchmark page.
Review URL: https://codereview.appspot.com/7309044

git-svn-id: http://pywebsocket.googlecode.com/svn/trunk@725 4ff78f4a-9131-11de-b045-6380ec9940d4