Removed all files in assets/
Added Task, RepeatingTask, and TaskManager.
Added a test for Box2D
Changed GameState from an Abstract Class to an Interface.
Changed GameStateManager#getGameState(GameState) to #getGameState(int)
Added default arial font to assets
Worked on the test for LibGDX's Stage API.
Wrapped EGApplication#render()'s line of code that calls #renderGame()
with a call to batch.begin() before it and batch.end() after it.