Level generation stuff

The constantly level generation with extras (coins) happens inside the update() loop, generating a block for each loop: to we don't get an FPS-drop when we need a new line of terrain.
Three major functions were added:
killPassedBlocks() - which kill blocks with Y < screen.y
generateBlock() - gather an dead block, revives and updates its position
generateCoin() - randomly generate an coin on Y

Also some helper variables were inserted to help the level generation.
Merge branch 'master' of https://github.com/whothey/SlideMe

Conflicts:
	SlideMe/src/com/uffs/slideme/PlayState.java

Also updating Ant and Ant Assets