Previously attempting to retrieve a user from the API who had been set

to inactive would result in a 404 Not Found, which was an issue for any

review requests or reviews they had created (as the link included would

not work). Now we return a user from the /api/users/<username>/ API

regardless of whether or not they are active. However, we still filter

out users from the /api/users/ API unless include-inactive=1 is

provided as a GET parameter to the request.

Ran unit tests.