huge commit...
* autoload temporary removed, until find better solution
* triangle walls added. It is working, but not stable at all...
* Collisions in separate class.
all interaction with walls are strategies now, applied to the wall object.
level stored in levels directory and can be changed in game
draw only objects that camera sees
Merge pull request #1 from varg90/master

changes gosu gem version. makes bundler install correctly
update fork