title: Vue ignore custom component tag
body: <p>On my site I am using Google CSE (custom search engine by google).  </p>
  
  <p>Here is my HTML:</p>
  
  <pre><code>&lt;div id="app"&gt;
    ...
    &lt;gcse:search&gt;&lt;/gcse:search&gt;
    ...
  &lt;/div&gt;
  &lt;script type="text/javascript"&gt;
      new Vue({ el: '#app' })
  &lt;/script&gt;
  </code></pre>
  
  <p>As you can see, I have a "gcse input" placed inside of my vue application. </p>
  
  <p>Therefore I am getting a warning: </p>
  
  <blockquote>
    <p>[Vue warn]: Unknown custom element: <code>&lt;gcse:search&gt;</code></p>
  </blockquote>
  
  <p>So my question is how it possible to stop attempting to initialize this custom component in Vue.js?  </p>
  
  <p>Thanks in advance.</p>