title: How to get the deselected value with Chosen
body: <p>I am using Chosen jQuery plugin, and I have successfully installed it.
  now I want to get the selected or deselected items, here is the docs:</p>
  
  <pre><code>http://harvesthq.github.io/chosen/options.html
  </code></pre>
  
  <p>It says on change trigger, it sends <code>select</code> and <code>deselect</code> as parameters, how could I access to those?</p>
  
  <p>for example:</p>
  
  <pre><code>$('#days').on('change', function(evt, params) {
      // alert selected val if the users selected new item
      // alert deselected val if the users deselected item
  }
  </code></pre>
  
  <p>Thanks</p>