User Timeout
When a user's session is resolved:
- It should set a "lastActive" field on the user to the current time stamp
- It should set an entry into the #0.activeUsers map, with a key of the current user's URI and a value of the current time stamp
- It should iterate through all entries in @0.activeUsers map, and any user whose last active time was more than 5 minutes ago should be moved to location -1, and should be removed from the table