Need to remove the rest of the animation blending code so that project builds properly.
Make clear distinciton between position and light_position, and add spotlight properties.
Allow setting if objects should cast shadows or not.
Actually apply light attenuation settings.
Update some tests.
Create lighting test, and fix lighting so shadows can be cast.
Allow models to be positioned relative to other models, or lights.
#cast_shadows should end with a "?" like other Ruby boolean methods.
Create Oni Node class from copy/paste with slight modifications to Model.
Node specific modifications.
Get new Node class to build correctly.
Allow accesing names for light and model.
Allow accesing name of nodes.