fixed wrong error message
    it('should assign user ID when created')
    it('should assign unique IDs when two users created')
    it('should have specified user name when created')
    it('should return null when user not found')
more ignores added
    it('should return same user when found')
renamed FakeDB.findUserByID -> FakeDB.getUserByID
    it('should return null when user is not in the session')
    it('should return null when attempting to create user in non-existing session')
make SessionController work via DB