Added two get variables and online users

//Now will pass two get variables
//last and ignore
//last will determine how many visits to return.
//ignore will ignore a certain user
//Example: http://<your web
server>/visits.php?last=30&ignore=Ignore%20User
//Also added current online users, this only works if you are using the
same DB
//for the visits as for your grid, and your presence table is named
"Presence"