title: How to push a protectedSource in django-ckeditor?
body: <p>I am currently using django-ckeditor for a site, It works great, but I need to a some In-article ads (google adsense). After saving a register the code is stripped and I don´t know where or how to set the protectedSource to allow the  tag.</p>
  
  <p>I have sucessfully allowed script content, but not the ins tag used by google adsense.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
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  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"&gt;&lt;/script&gt;
  &lt;ins class="adsbygoogle"
       style="display:block; text-align:center;"
       data-ad-layout="in-article"
       data-ad-format="fluid"
       data-ad-client="ca-pub-XXXXXXXXXXXX"
       data-ad-slot="XXXXXXXXXXX"&gt;&lt;/ins&gt;
  &lt;script&gt;
       (adsbygoogle = window.adsbygoogle || []).push({});
  &lt;/script&gt;</code></pre>
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  <p>My current CKEDITOR_CONFIGS definition in settings.py is like this:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>CKEDITOR_CONFIGS = {
      'custom': {
          'toolbar': 'Custom',
          'extraAllowedContent':'script ins',
          'removePlugins': 'stylesheetparser',
          #'protectedSource': ['/&lt;ins class=\"adsbygoogle\"\&gt;.*?&lt;\/ins\&gt;/g'],
          'toolbar_Custom': [
              {
                  'items': [
                      'RemoveFormat', 'PasteFromWord',
                  ]
              },
              {
                  'items': [
                      'Styles', 'Format', 'Bold', 'Italic', 'Underline',
                  ]
              },
              {
                  'items': [
                      'NumberedList', 'BulletedList', '-', 'Outdent', 'Indent'
                  ]
              },
              {'items': ['Blockquote', 'Outdent', 'Indent']},
              {'items': ['NumberedList', 'BulletedList']},
              {
                  'items': [
                      'JustifyLeft', 'JustifyCenter',
                      'JustifyRight', 'JustifyBlock'
                  ]
              },
              '/',
              {'items': ['Font', 'FontSize']},
              {'items': ['Source']},
              {'items': ['Link', 'Unlink']},
              {'items': ['Image', 'Flash', 'Table', 'HorizontalRule', 'Embed']},
              {'items': ['Smiley', 'SpecialChar', 'PageBreak', 'Iframe']}
  
          ],
          'extraPlugins': ','.join([
              'div',
              'autoembed',
              'embedsemantic',
          ]),
          'embed_provider': '//ckeditor.iframe.ly/api/oembed?url={url}&amp;callback={callback}&amp;api_key=abc123',
      },
      'default': {
          'toolbar': 'full',
          'removePlugins': 'stylesheetparser',
          'allowedContent': True,
      }
  }</code></pre>
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