DefaultRouter root view should use namespaced view names if needed.

[tomchristie]

Add support for the root API view to use appropriately namespaced view names. Won't need any changes to the router API, just an implementation detail.

Refs #2333, #2350.

[tomchristie]

The API root view can inspect the incoming request, determine the namespace if there is one on the request object, and modify the view names accordingly if so.

[rockymeza]

That sounds pretty badass, I think that would work. Do you think it could also be added to the HyperlinkedRelatedField (I'm not sure if that is correct behavior)? I wonder if that is too magical.

[tomchristie]

Note to self: Ensure this doesn't conflict with namespaced versioning.

[tomchristie]

Closed via efa5942.