First round of scripts

Code for health bars (which don't show up for some reason) and an enemy
that faces and moves toward the player.
Code for Demo

The test scene I put together.  The health bars show up, and the enemy
faces the player and moves toward him.
Merge pull request #3 from stpatrick923/master

Pat's Code
Added a mainmenu scene. Pressing the space button starts the demo from Pat