Revert "don't unregister RichTextPage from admin.site, pending mezzanine issue"
Revert "don't unregister RichTextPage from admin.site, pending mezzanine issue"

This reverts commit c472c5f6731323ffac3f41fbfcf079287847c056.

j00bar/django-widgy,j00bar/django-widgy,j00bar/django-widgy