Ball added

Billboard drawing for ball with geometry shader added.
Ball and collision

GLM added for collision, used for both win and linux.
Ball drawing is working.
Some collision classes added and begun being converted to GLM (from
D3DXxx)
Collision stuff added.

Made collision changes so it works with linux and windows. (GLM)
Added sphereVsSphere and SphereVsBox.
Objects has a boundingvolume now.

Vector2.h removed, using GLM instead.
Collision debugging

Drawing collision boxes and spheres.
Though it is faulty right now.
The box seems to be correct, problem seems to lie with sphere.
Merge

Merge with caaalh and mathias