title: show multiple values for labelField in selectize.js
body: <p>I have implemented selectize.js on my form and it's working fine below is my code</p>
  
  <pre><code>$('#searchbox').selectize({
    valueField: 'id',
    labelField: 'model',
    searchField: ['category', 'subcategory', 'model', 'make'],
    maxOptions: 10,
    options: [],
    create: false,
    closeAfterSelect: true,
    render: {
      option: function(item, escape) {
        return '&lt;div&gt;'
             + '&lt;strong&gt;'       
             + escape(item.subcategory) + '- ' 
             + '&lt;/strong&gt;' 
             + escape(item.make) + ' ' 
             + escape(item.model)  
             + '&lt;/div&gt;';
      }
    },
    load: function(query, callback) {
      if (!query.length) return callback();
      $.ajax({
        url: '/api/search',
        type: 'GET',
        dataType: 'json',
        data: {
          q: query
        },
        error: function() {
          callback();
        },
        success: function(res) {
          callback(res.data);
        }
      });
    },
    onChange: function(value){ },
    onItemAdd: function(value, $item){
      $(".item-type").prop( "disabled", true );
      $(".item-area").hide();
      $("#item-id").val(value); 
    },
    onItemRemove: function(value){
      $(".item-type").prop( "disabled", false );
      $(".item-area").show();
      $("#item-id").val("");
    }
  });
  </code></pre>
  
  <p>but after i select the option in popup results it only allows me to set one of the values as a labelField, currently its set to show model, how can I specify more than one value to show there for ex. make &amp; model </p>