title: rerenderEvents / refetchEvents problem
body: <p>I am not sure if I am using this correctly so my problem may be my mis-understanding rather than a bug or larger problem.</p>
  
  <p>I have a fullcalendar that gets initiated from doc ready like this (some code left out for brevity).</p>
  
  <pre><code>   function renderEvents() {
          var date = new Date();
          var d = date.getDate();
          var m = date.getMonth();
          var y = date.getFullYear();
          var technicians = $("div[ID*='ucTechnicians'] :hidden").val();
  
          var calendar = $('#calendar').fullCalendar({
  
  
         ...
              events: "JsonResponse.ashx?technicians=" + technicians,
         ...    
      }
  </code></pre>
  
  <p>The json response page successfuly returns the events filtered by the chosen technician on initial load.  On the main page is a control to change the technicians the user wants to see on the calendar.  I cannot get the calendar to re-render and pass the technicians param to the json reposne file.</p>
  
  <p>From button click I have tried calling renderEvents() again.  This puts a duplicate calendar on the page.  I have tried $('#calendar').('destroy') before calling renderEvents().  This works but if I am in a view other then the default month view it will allways reset and destroying rebuilding the calendar seems like a lot of work for a refresh.</p>
  
  <p>I have also tried $('#calendar').('rerenderEvents') and $('#calendar').('refetchEvents').  I have even tried to reset the source $('#calendar').fullCalendar('addEventSource', 'JsonResponse.ashx?technicans=' + technicians) ahead of time.</p>
  
  <p>In the last case I am able to watch the json response in debug and it picks up on the filter parameter and returns results filtered by the latest parameters but the calendar on the page does not refresh with the new values.</p>
  
  <p>How do I make the calendar refresh with new parameters?</p>
  
  <p>Thanks in advance.</p>