Added Game model.
Added GameTeam model.
Added validation and constraints to Game model.
Maded game_team team_id and team accessible.
Game accepts nested attributes for game_teams.
Fixed game_teams_attributes accessibility.
Added GamesController.
Remobed teams_controller_spec redunencies and chagned all delete_all to destroy_all
Added date_format helper.
Added games/index.html view.
Added games form partial view.
Added new and edit game views.