Added New Obstacles and background

two new box obstacles, I changed it so now if the player goes over the
boxes they boost for a set number of frames, less than the spikes.
Added Background and added the beginnings of camera panning.
For now I have random obstacles on.

To do:
- have specific patterns for obstacles and increasing difficulty.
- pan the camera when you get closer to the enemy.
- two new obstacles that the enemy will throw.
- art.