title: fullCalendar.js dayRender() callback not called in agendaWeek view
body: <p>Using fullCalendar.js v3, I'm trying to style certain timeslots (not entire days), however the <code>dayRender()</code> callback is not called if you're using the <code>agendaWeek</code> view.</p>
  
  <p>This appears to be a hole in the plugin (not a bug), so does anyone have a workaround?</p>
  
  <pre><code>$('#schedule').fullCalendar({
      defaultView: 'agendaWeek',
      dayRender: function( date, cell ) {
          // Never logs anything
          console.log('Running dayRender');
      }
  });
  </code></pre>