Harcoded name_urls

@DarylAntony I dislike these `settings.py` files in these applications with a passion.

Why not, in models.py have it look like this:

    from django.conf import settings
    URL_NAMES  = getattr(settings, 'MENUS_URL_NAMES', ["SENSIBLE DEFAULT",]

I can't see a situation where someone will update a `settings.py` file within a third party application.