TODO

- Add hooks to serialiser and publisher to set default **kwargs

- Provide an internal API layer that's devoid of de/serialising, and an outer layer.
    This should promote re-use of the facilities.

- Make CSRF configurable

- Make meta.next/meta.prev URLs

- Support something like formsets with datamappers

- Support prefixes with datamappers

- Add true 'read-only' solution to DataMapper fields.