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.
Merge branch 'master' of https://github.com/geisler/game_contest_server
Passing tests for new models