Use PlaceholderAdminMixin
Ignore different databases for the demo
Reverse the URLs of Zinnia with the namespace
Update the fields in admin accordingly to the new version of Zinnia
CMS_SEO_FIELDS is now useless
Fix the template for the slider rendering
Fix the random entries plugin
More consistent names for templates used
Fix the admin for the extension
Do not user meta_keywords anymore and front edit of the titles
Menu is front editable
Reduce the number of language
Fix the TagMenu
Rename the plugin tables
Update CSS compatibility fixes
Merge branch 'feature/cms-3.0-compatibility' into develop