SS_Alpha_8a

Branched off to test physics for movement code. switched to rigid
bodies. added a jump function. some very interesting results.

1. Cube now moves based off a force applied, this means that it rotates
everywhere. (can probably stop if we turn angular drag down to zero)
2. it collides with other stuff in the scene now... we should fix that
if we keep this setting.
3. jump function breaks door function. But I personally would like to
trigger doors using something other than space.