tests module should import test cases

init loads all python files in the tests directory, imports them as
modules and finds all TestCase subclasses and runs them.

Had to disable the one existing test; it assumes that there is already
data in the database; we'll need to rewrite this test slightly.
test the creation of new users

runs the ajax call, then checks that the new user isn't
staff/superuser, and can log in.
fix the existing test so that it actually works
test should not rely on the first user being the one it wants

also, it should clean itself up