Delete contest_manager tests.

When synchronizing with implementation, I forgot to delete these
files.  This commit accomplishes that task.
Merge https://github.com/geisler/game_contest_server into dev
Delete more tests

These are tests that are not implemented by students, but are
implemented by me. :(
Merge https://github.com/geisler/game_contest_server into dev
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 https://github.com/geisler/game_contest_server into dev
Merge https://github.com/geisler/game_contest_server into dev
Passing all database tables and validations