title: Fullcalendar, preventing user from selecting multiple day event
body: <p>In my fullcalendar <a href="http://fullcalendar.io/" rel="nofollow">http://fullcalendar.io/</a>
  I want to prevent a user to be able to create an event on multiple days</p>
  
  <pre><code>$('#calendar').fullCalendar({
      defaultView:  'agendaWeek',
      lang:         "fr",
      header:       false,
      timezone:     'local',
      minTime:      "08:00:00",
      columnFormat: 'dddd',
      selectHelper: true,
      selectable:   true,
      select: function(start, end, id, allDay) {
        var eventData = {
          start: start,
          end: end,
          id: 1,
          block:  true,
          editable: true,
          backgroundColor: "#469278"
        };
  
        // console.log(moment(eventData.start["_d"]).format("dddd"));
        // console.log(moment(eventData.end["_d"]).format("dddd"));
  
  
        $('#calendar').fullCalendar('renderEvent', eventData, true); // stick? = true
  
        // console.log(eventData);
        if (moment(eventData.start["_d"]).format("dddd") != moment(eventData.end["_d"]).format("dddd")) {
          $('#calendar').fullCalendar('unselect');
        };
        var day         = moment(eventData.start["_d"]).format("dddd");
        var start_time  = moment(eventData.start["_d"]).format("HH:mm");
        var end_time    = moment(eventData.end["_d"]).format("HH:mm");
        var id          = moment(eventData.end["_id"]);
  
        var slot        = {
          day: day,
          start_time: start_time,
          end_time: end_time
        };
        array_dispo.push(slot);
  
        $("#dispo_array").val(JSON.stringify(array_dispo));
        $('#calendar').fullCalendar('unselect');
      },
    });
  });
  </code></pre>
  
  <p>When a user is selecting a start date that is different from the end date of his event I thus tried to use the unselect method from the doc <a href="http://fullcalendar.io/docs/selection/unselect_method/" rel="nofollow">http://fullcalendar.io/docs/selection/unselect_method/</a> like this :</p>
  
  <pre><code>  if (moment(eventData.start["_d"]).format("dddd") != moment(eventData.end["_d"]).format("dddd")) {
              $('#calendar').fullCalendar('unselect');
            };
  </code></pre>
  
  <p>But unfortunately this code doesnt automatically deselects the current selection...</p>