Random Fix

Fixed the non-random randomness
Cleanup

comment cleanup
Map Updates, Enemy Addition, Obstacle Update, Nut Addition

- fixed a map bug that allowed the world to be shifted oddly
- added the enemy and standard enemy class
- updated Obstacle class
- added Nut class that extends Obstacle
- randomly placed enemies
- randomly placed nuts
SpriteManager Update for Nuts, Enemies

- I added a few lines to the SpriteManager to get the enemies and nuts
to show up.  Not sure if it's setup correctly though.