enemies may be killed now, they then block the way and every last one turns black.
Merge branch 'master' of github.com:Rialgar/GGJ2014

Conflicts:
	js/Enemy.js
attacking, damaging and EXTERMINATING! enemies
Merge branch 'master' of github.com:Rialgar/GGJ2014

Conflicts:
	js/Enemy.js
	js/Level.js