Added support for previewing student pages in show styling
Don't forget to allow falling back to the default page mode
Updated Wagtail version (for pagemodes)
Cleanup of urls.py
New version of Wagtail no longer needs urls.py to define urls for all admin sections
Merge branch 'feature/student-pagemodes' into staging

Conflicts:
	django-verdant/rca_show/models.py