Added a script for gravity so we don't have to use rigidbodies.  It's not very good, because it operates off the lowest block relative to the rest of the shape, so certain orientations still gravitate through objects.  I was thinking about trying shooting a ray from the blocks that face the ground, and calculate the distance to the nearest object.  If the distance is 0, stop moving.
Merge branch 'master' of github.com:bbrouse/shapesmith into block_gravity_script
Fixed gravity script so blocks won't be left hanging in the air.
Removed commented code blocks, readded isMoving variable (needed for when a block collides with the player)
Merge pull request #24 from bbrouse/block_gravity_script

Block gravity script