Updating usage docs
Updating usage docs

Alerting to include simple_history to INSTALLED_APPS.

pombredanne/django-simple-history,treyhunner/django-simple-history,luzfcb/django-simple-history,treyhunner/django-simple-history,luzfcb/django-simple-history,pombredanne/django-simple-history,emergence/django-simple-history,emergence/django-simple-history