title: How to clear selected value in angular-ui select2
body: <p>Im using angular-ui select2 plugin I cant find any solution for clear the selected input. how to clear the selected input ? thanks.</p>
  
  <pre><code>&lt;http://plnkr.co/edit/a3KlK8dKH3wwiiksDSn2?p=preview&gt;
  </code></pre>
  
  <p>I want somethig like this.</p>
  
  <p><img src="https://i.stack.imgur.com/F174y.jpg" alt="enter image description here"></p>