Test for user association from referees

We failed to check that all referees can refer to their creator.  This
test includes that association that wasn't being tested for
previously.  This existed in the ERD, but was simply missing in the
tests.
Initial Tests for creating Referees and Contests

These are the beginnings of tests that check that Referees and
Contests can be created.  More to come, obviously.
Delete contest_manager tests.

When synchronizing with implementation, I forgot to delete these
files.  This commit accomplishes that task.
Delete more tests

These are tests that are not implemented by students, but are
implemented by me. :(
Fill out referee tests.

These tests do a good job of completing the referee tests.  They are
quite robust now and try to check for most of the behavior that must
exist for the referee to be correct.  There should be quite a few less
tests for the referee after this commit, since the new tests would
have to deal with more edge cases and not the "normal" path through
the site.
Merge branch 'testing'
Updated tests