Added a handle to register tabs being closed
Added a clear method, bindings for tab events and fixed scope of the callbacks
Added a check to ensure we have events for a given tab ID, also added option for passing additional data
Added a removeTab method, fired the appropriate events for tab (could be incomplete still - needs testis testing), fixed a small bug with adding tabs and their href value
Passing data to callback fxn
Added code to hook only onto jquery.ui-tabs' activate and close handlers