Update view responses to return modified data

[smartspot2]

The Django views are currently inconsistent in what they return for PUT or POST requests. It's hard to say what the general convention or consensus seems to be regarding this point, but in our specific use case, it's easier to handle responses in the frontend queries if all endpoints return the modified or created resource. This way, we don't need to pass down any other fields from parent components (we'd only need the immediately relevant fields for the request, not the effects of the request), and the query handler has all the information necessary to invalidate any queries.

In the process of making this change, the views files have also been reformatted.