Zombies now spawn at spawn-points
small improvements
display a rectangle for the view
View frustum is now moving
Merge branch 'minimap-vfrustrum'
Improved responsiveness
Merge branch 'master' of https://github.com/ushu/z-project

Conflicts:
	z-project/GameLayer.mm
Allow deletion on Minimap
Merge branch 'master' of https://github.com/ushu/z-project

Conflicts:
	z-project/GameLayer.mm
Merge branch 'master' of https://github.com/ushu/z-project