Subjects API and some refactor

API url is now a subdomain. Must put `api.uno.dev` in hosts file

```api.uno.dev/v1/<resource name>```

Some un-DRY code in `Subjects` controller - the `NotFound` exception. I don't see the need to create a Service as of the moment. It seems pretty straightforward CRUD.
How do we make this usable for all actions? this seems only usabel for `concerns`