Also check BLOG_USE_FEATURED_IMAGE in templates when displaying blog post's featured image.
Merge
Added a sort_by template filter for general use.
Removed Slugged.Meta.ordering since it'll generally always be nuked by Meta on a subclass - and added correct ordering to BlogCategory.
Clean up BlogCategory.Meta.
Move clean_content to new DisplayableAdminForm.
Merge branch 'master' into slug_reset