title: Tagging with AJAX in select2
body: <p>I am doing tagging with <a href="http://ivaynberg.github.com/select2/#tags">select2</a></p>
  
  <p>I have these requirements with select2:</p>
  
  <ol>
  <li>I need to search some tags using select2 ajax</li>
  <li>Also I need to use "tags" in select2 which Allows values that are not in the list(Ajax result).</li>
  </ol>
  
  <p>Both the scenarios work independently. But joined together aJax values are only populated. If we type any other values not in the list then it says "no matches found"</p>
  
  <p>My scenario If user type any new value which is not in the list, allow them to make up their own tag.</p>
  
  <p>Any way to make this work?</p>