Delete empty test file

What?

EDIT: Oh, right, Travis
Clean up code formatting in blog/models.py
Add back "legacy" faculty overview url mapping

omg i'm so dumb
Add tests for some get_absolute_url methods

For issue #201. Still missing tests for other types of URL-getting
methods and for the remaining get_absolute_url() methods, but that
has to be done after the fixtures system is improved (see #202).