set_slug now save itself
set_slug now saves itself
Merge branch 'drag-slug-fix' of https://github.com/dustinrb/mezzanine into drag-slug-fix

Conflicts:
	mezzanine/pages/models.py
Handle installing initial data with Django 1.7's syncdb signals. Closes #1123.
Merge
Added Dustin Broderick to AUTHORS.
Remove redundant page save in slug tests.