title: Fullcalendar drag and drop allday
body: <p>I have a fullcalendar with both normal events and allDay events.</p>
  
  <p>I want to disable the allDay-events from being able to be dragged into normal events in the agenda view.</p>
  
  <p>The allday events have both start-time and end-time set from the begining so I cant check if the endtime is null.</p>
  
  <p>Perhaps there is a way in the eventDrop-function to block this off?</p>