title: search in Selectize dynamic dropdown not working
body: <p>Hi I am new to selectize plugin. I have changed code in github example (<a href="https://github.com/brianreavis/selectize.js/blob/master/examples/github.html" rel="nofollow">https://github.com/brianreavis/selectize.js/blob/master/examples/github.html</a>) to fit for my application.
  When I write something in input field it searches from data base but does not show dropdown list. It shows list when I remove text in input field. And when I input text again the dropdown vanishes. What I am doing wrong?</p>
  
  <pre><code>$('#select-tag').selectize({
                  valueField: 'name',
                  labelField: 'name',
                  searchField: 'name',
                  options: [],
                  create: false,
                  render: {
                      option: function (item, escape) {
                          return '&lt;div&gt;' +
                              '&lt;span class="title"&gt;&lt;span class="name"&gt;' + escape(item.name) + '&lt;/span&gt;&lt;/span&gt;' +
                              '&lt;span class="description"&gt;' + escape(item.info) + '&lt;/span&gt;&lt;/div&gt;';
                      }
                  },
                  score: function (search) {
                      var score = this.getScoreFunction(search);
                      return function (item) {
                          return score(item) * (1 + Math.min(item.watchers / 100, 1));
                      };
                  },
                  load: function (query, callback) {
                      if (!query.length) return callback();
                      $.ajax({
                          url: '/api/forum/SearchTags?s=' + encodeURIComponent(query),
                          type: 'POST',
                          error: function () {
                              callback();
                          },
                          success: function (res) {
                              console.log(res);
                              callback(res.slice(0, 10));
                          }
                      });
                  }
              });
  </code></pre>