Automated MC

I added a couple settings to the MC page to enabling setting the round time AND a time between rounds.
![mc-settings](https://cloud.githubusercontent.com/assets/688912/3210495/ebd07a1a-eec6-11e3-99ec-1b6d2391d4d8.png)

The game will automatically start when the "Time Between Rounds" expires. The lobby shows a countdown until the next game.

![time-left](https://cloud.githubusercontent.com/assets/688912/3210497/2087a92c-eec7-11e3-8a37-2946fc5cc20a.png)

The countdown won't start until at least 2 people are connected. (Why play battle tetris alone?)

Setting the in-between round time to 0 just goes back to requiring a manual start. This is the default setting. The default round time is still set at 5 minutes (300 seconds).