Edited sprites to have turretless tank and turret separate from each other.  Edited javascript to utilize these sprites.
Merge pull request #3 from dckuehn/master

Edited sprites to have turretless tank and turret separate from each oth...
added debug setting for drawing collision boundaries (Tank and Map objects)
added turn to update function and maxTurnSpeed variable
improved tank aabb collision box
check block/tank polygon collision before stopping
Merge branch 'master' of github.com:mrmoses/thunder-tanks

Conflicts:
	js/Tank.js
Merge branch 'master' into gh-pages