title: Prevent rendering of events that occured before a given date
body: <p>I am trying to remove all events on my full calendar that fall before a certain start date (let's say the start date is Oct-17-2016).</p>
  
  <p>Here is my code that does exactly that:</p>
  
  <pre><code>$("#calendar").fullCalendar('removeEvents', function(eventObject) {
      //return true if the event 'eventObject' needs to be removed, return false if it doesn't
      if (moment(eventObject.start).isBefore(start_date)) {
          return true;
      }
  });
  </code></pre>
  
  <p>So upon loading the page, all events falling before Oct-17-2016 for the month of October are gone. However if I navigate to the next month (i.e November) then navigate back to October, all the events that were deleted are suddenly back!</p>
  
  <p>How do I make it so that upon initialization, the events before my start date stay deleted. Will I need to wrap this script in an event that is triggered whenever a month change occurs? </p>