Remove dead code
Re-arrange some code to minimize diff between maze & karel
Add all the ball (ie pile/hole) logic to maze.js
Remove finishes from karel levels
Merge branch 'turtle-page-levels-etc' into tiles

Conflicts:
	src/karel/karel.js
	src/maze/maze.js
Fold karel blocks and friends in to maze
Kill the karel directory
Merge branch 'mooc' into tiles
Remove karel styles
Remove karel from dev index
Support sparse rows in getTile
Fix checkSuccess
Merge pull request #79 from brandonbloom/tiles

Merge Maze & Karel