title: Using holder.js to display image thumbnails
body: <p>I'm trying to display an image usign holder.js but instead of the image the example image is being shown. </p>
  
  <pre><code>&lt;img src='http://upload.wikimedia.org/wikipedia/sr/0/0c/Firefox-logo.png' data-   src="holder.js/140x140" alt='Thumbnail' class="img-thumbnail img-responsive"/&gt;
  </code></pre>
  
  <p>Is this the correct method of using holder.js? Can someone post an example for displaying an image using holder.js?</p>