Add game scaffold
Migrate game model
Move games controller to /admin scope
Check admin permissions for the game controller
Generate problems scaffold
Migrate problems model
Move problems controller to /admin scope
Add cancan authorization to problems controller
Add links to problems & games controller from admin interface - incomplete because /admin/games is broken
Clean up routes a bit
Fix CanCan problem in games controller and make open_games actually display the correct info
Add defaults to player2_id and winner_id so games controller knows when a game hasnt started
Add start time to games model, as the game starts when two players are found, not when the game is created
Add elo rating to users
Add game rating to games/open response