Physics system handles removes better
Static entities in physics system
Added test to see how entity removal worked.
Merge pull request #34 from thelukester92/sprite-enhancements

Rendering system enhancements and fixes
Merge pull request #43 from thelukester92/master

Merge changes in master to physics branch
Fixed a couple of bugs and tested out static entities.
Merge pull request #38 from thelukester92/physics-enhancements-and-fixes

Physics system enhancements and fixes
Merge pull request #44 from thelukester92/master

Merge changes in master to camera branch