title: Select2 doesn't apply on select element
body: <p><code>Select2</code> is simply not applied on the custom html select. No errors thrown as well.</p>
  
  <pre><code>$("#product").select2();
  </code></pre>
  
  <p>This renders absolutely the normal html select element. Again, no single error in the console. Any idea? Could it be because of the <code>3.3.1</code> version of jQuery? Thank you!</p>