Add answers to Turtle levels (MOOC branch).
Review URL: https://codereview.appspot.com/9097044

git-svn-id: http://blockly.googlecode.com/svn/trunk@799 c400ca83-b69d-9dd7-9705-49c6b8615e23
Compile JavaScript and Python generators into a single file each.
Review URL: https://codereview.appspot.com/9135043

git-svn-id: http://blockly.googlecode.com/svn/trunk@801 c400ca83-b69d-9dd7-9705-49c6b8615e23