Offer a setting for the "admin" namespace for url reversing

[kmahelona]

While the canonical thing to do is have "admin" be the url namespace for admin, we've got TWO different admins. I've since moved away from having one be "admin" for some unforgotten reason. Anyway I was wondering if we could have a setting so that one could define the namespace url to use for colloquialisms. I'm not sure if this is against the Django philosophy.

For example, this exists,

    change_view = 'admin:%s_%s_change' % (
        item_cls._meta.app_label, item_cls._meta.model_name)

but instead what if we could do,

    change_view = '%s:%s_%s_change' % (
        settings.COLLOQUIALISMS_ADMIN_NAMESPACE,
        item_cls._meta.app_label, item_cls._meta.model_name)

where COLLOQUIALISMS_ADMIN_NAMESPACE="some_string".