Add arrows for left/right.  Feedback from children.
Review URL: https://codereview.appspot.com/8665045

git-svn-id: http://blockly.googlecode.com/svn/trunk@764 c400ca83-b69d-9dd7-9705-49c6b8615e23
Add Puzzle app.
Review URL: https://codereview.appspot.com/8880044

git-svn-id: http://blockly.googlecode.com/svn/trunk@765 c400ca83-b69d-9dd7-9705-49c6b8615e23
Adding binary files for the puzzle.

git-svn-id: http://blockly.googlecode.com/svn/trunk@766 c400ca83-b69d-9dd7-9705-49c6b8615e23