title: Select2 obtaining removed value from multiple
body: <p>I am using a theme which has got select2 version 3.4.3. I want to obtain the removed value ID, so I tried with:</p>
  
  <pre><code>$('#mymultiple').on("select2:removed", function (e) {
      console.log(e.val);
  })
  </code></pre>
  
  <p>But it does not detect the event. Then, I tested:</p>
  
  <pre><code>$('#mymultiple').on("select2:unselect", function (e) {
      console.log(e.val);
  })
  </code></pre>
  
  <p>But it gives me an undefined value, although the object has some info:</p>
  
  <pre><code>$('#mymultiple').on("select2:unselect", function (e) {
      console.log(e);
  })
  </code></pre>
  
  <blockquote>
    <p>Object { type: "select2:unselect", params: Object, timeStamp:
    1473273802173, jQuery18308796073916839738: true, isTrigger: true,
    exclusive: undefined, namespace: "", namespace_re: null, result:
    undefined, target: , ...}</p>
  </blockquote>
  
  <p>I have to use this version because I need to use the styles given by the template project (I test 3.5.3 and <code>removed</code> works ok, but I can not import the styles correctly). So how can I get the removed value from the multiple select?</p>