Release/time logging fixed

 - Calculates average arrival and departure times for each person in the database each day. 
    (cron job runs at 6:00am)
 - Every 5 minutes (easily changed to what ever value) The front end application requests a new list of users   which are ordered by the server.
 - Whenever a user signs in or out the time and day of the week is stored in the database
 - If there is no historical data for users on a particular day of the week the systems defaults to 9am - 5pm
 - As more and more data is stored the estimation will become more precise.
 - There are many statistical techniques that could be implemented in order to gain a more precise guess.