title: ifChanged event of iCheck library is triggered for only first radio button's changes
body: <p>I am trying to trigger iCheck's ifChanged event. But it only triggers when I changed my selection to be the first choice (Read) and when I changed my selection from the first choice (Read) to either of the other choices. I mean whenever the first choice is the subject of the change, console.log prints 'R' to console. </p>
  
  <p>Whenever a change is made between second and third choices (Unread, All) the event is not triggered at all.</p>
  
  <p>I want it to be triggered every time I change my choice and print the value associated with the new choice.</p>
  
  <p>What am I doing wrong? </p>
  
  <pre><code>&lt;script&gt;
     $( document ).ready(function() {
         $( 'input').iCheck({
             radioClass:'iradio_minimal-blue'
         });
         $( '#read_flag').on('ifChanged', function(event) {
             console.log( $(this).val() );
         });
     });
  &lt;/script&gt;
  
  &lt;div class="form-group"&gt;
      &lt;label&gt;
          &lt;input type="radio" name="read_flag" id="read_flag" value="R"&gt;
          Read
      &lt;/label&gt;
      &lt;label&gt;
          &lt;input type="radio" name="read_flag" id="read_flag" value="U"&gt;
          Unread
      &lt;/label&gt;
      &lt;label&gt;
          &lt;input type="radio" name="read_flag" id="read_flag" value="A"&gt;
          All
      &lt;/label&gt;
  &lt;/div&gt;
  </code></pre>