Event URL & overlays

delete/edit the event. This was not possible in 1.5+ any longer, cause
it used the link OR the div. This small fix should work for all and let
me add the menu again.  Demo:
http://kompsoft.de/test/eqdkp/ajax/fullcalendar/demos/
/The demo is 1.5, but i tested it for 1.6 as well)