title: Full calendar: change background of weekends
body: <p>I'am trying to disable weekends in full calendar but this option weekends:false </p>
  
  <pre><code>var calendar = $('#calendar').fullCalendar({
  
      header: {
  
          left: 'prev,next today',
          center: 'title',
          right: 'month,agendaWeek,agendaDay'
              },
  
      weekends: false,
      ........});
  </code></pre>
  
  <p>delete weekends from the calendar or i want to disable only the two days by change the background color and make them unselectable.<br>
  what should i  do? 
  thanks for any help </p>