First cut of actually updating components.

There's a critical bug to fix tomorrow:
1. Create gameobject with children { cube, sphere }
2. Convert to prefab.
3. In Maya, parent sphere under cube.
4. Switch to unity, all is good.
5. In maya, parent sphere under gameobject.
6. Switch to unity, sphere loses its meshfilter/meshrenderer.

Author: Benoit Hudson