Kick non-admins after being idle for an hour. Any user activity resets this timer. This is a roundabout way of addressing #52, but brings more to the table in general and is significantly simpler than making each game have a timer task to manage it.

Increase the ping timeout delay from 45 seconds to 90 seconds, while reducing the timeout on long poll requests on the client side to 30 seconds. (This is still less than the 25 seconds that LongPollServlet will wait.)