Replace Maze's next-level confirm with a dialog.  Includes a Pegman animation that tracks the mouse.  Fix code to always be LTR.

R=spertus@google.com

Review URL: https://codereview.appspot.com/13033043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1227 c400ca83-b69d-9dd7-9705-49c6b8615e23