More test love.

Use Fuubar by default for RSpec tests.
Remove Root.

All of its responsibilities go to HashModelObject; some changes to
ModelObject#url have made this possible.

This breaks the API inspector, for now- this will be fixed shortly.
Try looking for HAML for the handler type first.

If ENOENT is found, then fall back to the class name as previous.

This allows the root to be a HashModelObject and yet still have its own view.