Add scrollbars to code app for js/py/xml.  Fix rotating pegman in Maze's level-complete dialog for Firefox.  Remove 'green' from turtle message.

R=spertus@google.com

Review URL: https://codereview.appspot.com/12994045

git-svn-id: http://blockly.googlecode.com/svn/trunk@1240 c400ca83-b69d-9dd7-9705-49c6b8615e23