Group collision-checks.
Enable collisions between minions with world and minions with other
minions.
Hard-code minions, collide with world bounds and platforms.
hintergrundmusik + effekte
Merge branch 'music' of https://github.com/mayermi/turtle into mayermi-music

Conflicts:
	js/models/minion.js
	js/states/play-state.js
	turtle.js
happy-loop works without pause
Merge pull request #11 from mayermi/music

happy-loop works without pause
Play (correct) death animation.
Correctly replace animations and add shell to them.
Merge branch 'master' of github.com:dhabersack/turtle
Add sliding terrain to JSON-configuration, decrease horizontal drag on
sliding terrain.
Merge branch 'sea-level--switch-levels' of https://github.com/mayermi/turtle into mayermi-sea-level--switch-levels

Conflicts:
	js/config/levels/level-1.js
	js/models/player.js
	js/states/play-state.js
	turtle.js