Make the config object lazy for old Djangos.
Make the config object lazy for old Djangos.

This should prevent import time side effects from instantiating the config object directly there.

Andrey86/django-constance,vinnyrose/django-constance,django-leonardo/django-constance,michaelkuty/django-constance,gmflanagan/waterboy,jazzband/django-constance,winzard/django-constance,jonzlin95/django-constance,dmugtasimov/django-constance,metalpriest/django-constance,jazzband/django-constance,APSL/django-constance,jerzyk/django-constance,jonzlin95/django-constance,django-leonardo/django-constance,Andrey86/django-constance,pombredanne/django-constance,jmerdich/django-constance,jmerdich/django-constance,vinnyrose/django-constance,pombredanne/django-constance,askabelin/django-constance,jerzyk/django-constance,APSL/django-constance,jezdez/django-constance,askabelin/django-constance,thorgate/django-constance,michaelkuty/django-constance,metalpriest/django-constance,dmugtasimov/django-constance,jezdez/django-constance,jazzband/django-constance,thorgate/django-constance,winzard/django-constance