title: Grouping results in Select2
body: <p>Is it possible somehow to <strong>group results</strong> in a Select2 component when it's not using <code>&lt;select&gt;</code> tag, but <code>&lt;input type="hidden"&gt;</code>, and results are provided as "data" option in configuration object?</p>
  
  <pre><code>var select2Options = {
    data: {
      results: myArrayOfResults
    }
  };
  </code></pre>