Backend Physics calculations correct
Merge branch 'master' into lwjgl
Convert most Renderer methods to non-static so it can be instantiated.
Add a decent main method so that both simulation and rendering can happen at once.
Comments added to object in space and subclasses
Rotated the universe so it looks right.
Merge branch 'master' of github.com:Arctem/orbit_sim
Fix compile error in test.java due to new SolarSystem constructor.
Increased rate at which we process sim steps.
Merge branch 'master' into twl
Fix close button to work properly.