Add Player model to admin.
Override get_form() method for filtering free (unregistered) users from 'Players' group.
Add PLAYERS_GROUP_NAME='Players' attribute to settings module.

On branch dev
	modified:   chess/settings.py
	modified:   main/admin.py
Update urls module: add urls maps for serve media and static files.

On branch dev
	modified:   chess/urls.py
Add Game model for store games data
(tournament_ref, number_of_round, referee_ref, date).
Add Game model to admin

On branch dev
	modified:   main/admin.py
	new file:   main/migrations/0004_auto__add_game.py
	modified:   main/models.py
Add django-debug-toolbar to the project.
Copy to project and modify the 'brand' block in 'base_site.html' template.

On branch dev
	modified:   chess/settings.py
	modified:   pip_install.txt
	new file:   templates/admin/base_site.html
Add some fields to Game model.
Update schema data in database by South application.

On branch dev
	modified:   main/migrations/0004_auto__add_game.py
	modified:   main/models.py