title: FullCalendar: get new start / end times while resizing
body: <p>I've been trying to solve this problem for a few hours now, but I can't figure out how.
  I have a small popover which is displayed next to a FullCalendar (fullcalendar.io) event while resizing / dragging it and I want to display the new start / end times immediately inside it while resizing, just like it is displayed on the event itself (This is meant to be a confirm / adjust change popover). I thought it would be a very messy approach to try to use this text of the event:</p>
  
  <pre><code>$('.fc-helper-skeleton .fc-time &gt; span').text()
  </code></pre>
  
  <p>Maybe someone has an idea how to do this. If FullCalendar does this by default, I assume there should be an easy way to get to these values while resizing?</p>
  
  <p>It would be great if i could get the values as moment objects while resizing. Or is there a performance reason why this feature doesn't exist?</p>