Fix aspect ratio on Plane icon (sigh).

git-svn-id: http://blockly.googlecode.com/svn/trunk@1470 c400ca83-b69d-9dd7-9705-49c6b8615e23
Improve Puzzle icon.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1471 c400ca83-b69d-9dd7-9705-49c6b8615e23