title: django-tinymce removes bootstrap HTML code
body: <p>I'm using/testing django-cms (2.3.5) + bootstrap based templates.
  Using django-tinymce I add the code:</p>
  
  <pre><code>&lt;a class="carousel-control right" href="#this-carousel-id" data-slide="next"&gt;›&lt;/a&gt;
  </code></pre>
  
  <p>But django-tinymce removes "data-slide="next"" </p>
  
  <pre><code>&lt;a class="carousel-control right" href="#this-carousel-id"&gt;›&lt;/a&gt;
  </code></pre>
  
  <p>And of course nothing works.</p>
  
  <p>Using WYeditor I found no way to modify the options in settings.py.
  Using tinyMCE I can :</p>
  
  <pre><code>TINYMCE_DEFAULT_CONFIG={
      # General options
      'mode': "textareas",                   
      'theme': "advanced", 
      'remove_linebreaks': "false",
  
      'convert_urls': "false",
      'relative_urls': "false",
      'theme_advanced_resizing': "true",
      'paste_auto_cleanup_on_paste': "true",
      #'preformatted': "true",
  
      'valid_elements': "+*[*]",
  
      'width': "100%",
      'height': "300px",    
  
      'theme_advanced_buttons1' : "formatselect,separator,bold,italic,hr,separator,link,unlink,separator,bullist,numlist,separator,undo,redo,",
      'theme_advanced_buttons2' : "|,help,code,|",
      'theme_advanced_buttons3' : ""  ,
      'theme_advanced_blockformats' : "p,h1,h2,h3,blockquote",
      'theme_advanced_toolbar_location' : "top",
      # Example content CSS (should be your site CSS)
      #'content_css': 'css/example.css',    
      #'content_css' : "/media/css/tiny_editor.css" 
  }
  </code></pre>
  
  <p>Workflow:</p>
  
  <ul>
  <li>I open the HTML popup</li>
  <li>I copy the code</li>
  <li>I reopen the popup and the wanted code is there</li>
  <li>I save the page and I reopen the popup and the code has changed!</li>
  </ul>
  
  <p>How can I avoid this behavior?</p>
  
  <p>I also added the options to keep the spaces/tabs/comments/, to keep the absolute path, but /static/images/path/ is always converted to ../../../../../static/*. </p>
  
  <p>What do I have to check/change?</p>
  
  <p>Thanks!</p>