Skeleton Experimentation

Trying to find away to make bone animation efficient, but also
incredibly easy to use
Early Camera Implementation

Scenes now have a a propery .camera which holds an object with
functional properties .x and .y.  Angle and zoom are not yet
implemented.

Layers now also have .scrollRateX and .scrollRateY properties, which
affect how much a layer appears to move when the camera is moved.  For
example, if a layer's scrollRateX is set to 0.5, objects on this layer
will appear to move at half the speed of the camera.
Early Polygon Objects... again

Decided polygons were necessary anyway, for easier collision detection
down the road.