title: How to trigger event resizing in fullcalendar
body: <p>fullCalendar have eventResizeStart, eventResizeStop and eventResize  events.</p>
  
  <p>But I can't found a eventResizing event.</p>
  
  <p>How I can trigger (manually) an event on every change when user are resizing an item of calendar?</p>
  
  <p>I need to update dynamically the content of event meanwhile is being resized, something like:</p>
  
  <pre><code>+----------------+
  | Event Title    |
  | From: {from}   |
  | To: {to}       |
  +----------------+
  </code></pre>
  
  <p>I need to update <code>{from}</code> and <code>{to}</code> when mouse moves in resize operation.</p>