define USE_BULLET_COLLISIONS in the Xcode project settings

this way @JimAnkrom won’t have to change that file every time he pulls
changes
Paddle hit position influences ball return angle (Pong-like)
Merge branch 'master' of https://github.com/VideoBleep/bleepout
Fix cartesianToSpherical so modifier spawn locations are correct (fixes #59)
Make modifiers despawn at horizon
Merge branch 'master' into admin

Conflicts:
	src/core/SpaceController.cpp