title: retrieve events which has a specific class in fullcalendar
body: <p>I want to get client events which has only a specific class. I need to get event objects which has the particular class. I tried following two ways.</p>
  
  <pre><code>1. $('#calendar').fullCalendar('clientEvents',{className: 'class'}
  2. $('#calendar').fullCalendar('clientEvents',{className: ['class']}
  </code></pre>
  
  <p>Did not work.</p>