Users can be created without a home.
Go with render json: for now.
POST /users/ request spec.
Use AM::Serializer to shape API response data.
Updated data model.

Finally makes some kind of sense. Will lend itself to a MongoDB-embedded
structure if I decide to go down that road.
Serializer updated to reflect updated data model.
Factories updated to new data model.
Specs updated to reflected updated data model.
Not going to rest controllers/routing for now.

Requests and model behavior is enough for this API app.
Yeah, updated because of updated data model.

Plus: Stops uses REMController.
Not going to use Helpers for the time-being.
Last but not least: routes updated to new DM.