Add close button to console.html.
Add close button to console.html.

Review URL: http://codereview.appspot.com/3799046

git-svn-id: a751b5b3dcfba0ee4592a85c40d2fdd063ca0d53@378 4ff78f4a-9131-11de-b045-6380ec9940d4

XiaonuoGantan/pywebsocket,XiaonuoGantan/pywebsocket