Version 0.90		04-01-2013		Initial release
Version 0.91		05-01-2013		Renamed events
									Renamed user_backup to backup_user
									Removed "autoincrement"definition
									Fixed typo while updating (for unix platform)
									Updated install instructions
Version 0.92						Fixed missing quote in Holiday.php
									Added additional option for absence
									Build in check on valid backup user