title: CKEditor automatically strips classes from div
body: <p>I am using <a href="http://ckeditor.com/" rel="noreferrer">CKEditor</a> as a back end editor on my website. It is driving me round the bend though as it seems to want to change the code to how it sees fit whenever I press the source button. For example if I hit source and create a <code>&lt;div&gt;</code>...</p>
  
  <pre><code>&lt;div class="myclass"&gt;some content&lt;/div&gt;
  </code></pre>
  
  <p>It then for no apparent reason strips the class from the <code>&lt;div&gt;</code>, so when I hit source again it has been changed to...</p>
  
  <pre><code>&lt;div&gt;some content&lt;/div&gt;
  </code></pre>
  
  <p>I presume this irritating behaviour can be turned off in the <code>config.js</code>, but I have been digging and cant find anything in documentation to turn it off.</p>