Cleanup in gui.py.
Optimizes Model.initialize.  Before: ~ 2.2s − After: ~ 0.8s.
Merge branch 'master' of https://github.com/boskee/Minecraft
Optimizations.  Saves ~ 0.2s on initialization.
Merge branch 'master' of git://github.com/BertrandBordage/Minecraft

Conflicts:
	gui.py