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. :(
Fix FactoryGirl Contest creation

I forgot to change the name of the field and merge this into
FactoryGirl creation.
And fixup the spec to check for right field.

This file also needs updating.
Getting latest tests
Merge https://github.com/geisler/game_contest_server
Set up for adding new models