Create basic Crab creature class.
Change moment of inertia for Crab so it can spin around.
Load Crab code and create a crab in-world, with proper collisions.
Add objects to space using Space#add instead of Component::Physics#add_to
Prototype Stats component interface.
Try updating components using iteration over an Array.
Note that old interface to add objects to space still works.
Remove unnecessary commented out code.