Maintain room statistics

[seshrs]

1. Rooms should keep track of past player names in the room and offer them as suggestions when beginning a game. (The interface should also allow adding new players before the game begins.)

2. Don’t store game state on the server.

3. After a game is completed, server should increment the counts of # of wins and # of games played by each player.

4. Add another tab to view room statistics. The statistics that I’m interested in are win-history, # of wins, # of games played, and win-percentage.