Update 0.1.1

I have added some functionality to the game.  I am hoping that flying the UFO will feel intuitive and fun all by itself before adding any more complex gameplay.

• You can now rotate the camera around the UFO.
• The camera will change it's field of view, zooming in and out, when the middle mouse scroll wheel is rotated.
• The UFO will move in the direction the camera is pointing when pressing W.  A & D will move it perpendicular to the camera.  This is essentially the same as before the update, but since the camera angle can now rotate, all the scripts had to be adjusted accordingly.
• The UFO will now bounce back from the edge of the map. 

I hope you enjoy the new functionality.