Merge pull request #2 from ozzmotic/develop

Added GUI elements: loading scene with menu, boost indicator
I redid Everything, changed Asteroid health to CS. added Input Constants
Fire, AltFire, Reload for left click, right click, and r respectively.
added Main Rifle, Shotgun, RocketLauncher, Sniper Rifle, Plasma Rifle
Scripts. Added a prefab destruct script for bulletholes on objects.
Merge pull request #3 from CinnamonBagels/develop

Pulled up Sam's changes