title: events' title is not displayed in FullCalendar
body: <p>I developed a full calendar page, in which the title of the 'holidays' event is not displayed and this happens while i give the rendering background only. It is annoying me for a while, for i do not know where am i making a mistake..</p>
  
  <p>My code is as follows:-</p>
  
  <pre><code>$(document).ready(function() {
  
  $('#calendar').fullCalendar({
  
  utc: true, 
  header: { 
  left: 'prev,next today EventButton', 
  center: 'title', 
  right: 'month,agendaWeek,agendaDay' 
  }, 
  
  editable: false, 
  droppable: true, 
  
  eventSources: [                        
                      {
                          url: "&lt;?php echo base_url() ?&gt;common/calendar/show_holidays",
                          rendering : 'background',
                          type: 'POST',
                          //backgroundColor : '#A4F80E',
                          //color: '#DAF7A6',   
                          //textColor: 'black'
  
                      }                    
                  ],
  });
  
  });
  </code></pre>
  
  <p>Through the controller, i am passing the holidays' event. In the above code if i comment the rendering - background then i get events' title.</p>
  
  <p>My sample output is :-</p>
  
  <p><a href="https://i.stack.imgur.com/yqo2U.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yqo2U.png" alt="Title not displayed while rendering"></a>  </p>