title: CKEditor 4.2.2 - allowedContent = true is not working
body: <p>I guess I've read most of the SO questions and CKEditor documentation about this, but it does not work for me.</p>
  
  <p>It should be plain and simple, in my CKEditor config.js, I have this : </p>
  
  <pre><code>CKEDITOR.editorConfig = function(config) {
      config.allowedContent = true;
  };
  </code></pre>
  
  <p>But the html is still filtered and this piece of code is being stripped : </p>
  
  <pre><code>&lt;p&gt;
  &lt;a href="/site/public/press.pdf"&gt;&lt;span class="icon-presseFile"&gt;&lt;/span&gt;&lt;/a&gt;
  &lt;a href="/site/public/pics.zip"&gt;&lt;span class="icon-pressePics"&gt;&lt;/span&gt;&lt;/a&gt;
  &lt;/p&gt;
  </code></pre>
  
  <p>into this : </p>
  
  <pre><code>&lt;p&gt;&amp;nbsp;&lt;/p&gt;
  </code></pre>
  
  <p>The <code>&lt;span&gt;</code> elements are font icons.</p>
  
  <p>Any help would be greatly appreciated.</p>
  
  <p><em><strong>EDIT</em></strong>
  It works if I add some text in the <code>&lt;span&gt;</code> elements (but I don't want tohave to do that)</p>