title: ng-show does not work with checkbox switch
body: <p>I am using a checkbox switch that is based on the bootstrap switch (documentation here: <a href="https://tictail.com/developers/documentation/uikit/#Switches" rel="nofollow">https://tictail.com/developers/documentation/uikit/#Switches</a>).</p>
  
  <p>I want to use ng-show on an element just like in the example here:
  <a href="https://docs.angularjs.org/api/ng/directive/ngShow" rel="nofollow">https://docs.angularjs.org/api/ng/directive/ngShow</a></p>
  
  <p>However nothing happens when I click on the switch (check the checkbox tied to the switch).</p>
  
  <p>I used an existing plunker to put the issue in the right context:
  <a href="http://embed.plnkr.co/LRSGXqxjtbYcr6rjTj69/" rel="nofollow">http://embed.plnkr.co/LRSGXqxjtbYcr6rjTj69/</a></p>
  
  <p>HTML:</p>
  
  <pre><code> &lt;fieldset&gt;
    &lt;legend&gt;Test switch&lt;/legend&gt;
    &lt;div class="form-group"&gt;
      &lt;label for="testSwitch"&gt;Test switch&lt;/label&gt;&lt;br&gt;
      &lt;div class="switch" init-switch&gt;
        &lt;input type="checkbox" ng-model="testSwitch"&gt;
      &lt;/div&gt;
    &lt;/div&gt;
  &lt;/fieldset&gt;
  
  &lt;fieldset ng-show="testSwitch"&gt;
  ...
  </code></pre>
  
  <p>Thanks!</p>