Overhaul of Maze app.  New levels.

git-svn-id: http://blockly.googlecode.com/svn/trunk@643 c400ca83-b69d-9dd7-9705-49c6b8615e23
Prepare plane app for multiple languages.

git-svn-id: http://blockly.googlecode.com/svn/trunk@644 c400ca83-b69d-9dd7-9705-49c6b8615e23