Docs: add testing instructions for contributors
Docs: add testing instructions for contributors

d9pouces/django-pipeline,jazzband/django-pipeline,cyberdelia/django-pipeline,jazzband/django-pipeline,beedesk/django-pipeline,cyberdelia/django-pipeline,cyberdelia/django-pipeline,beedesk/django-pipeline,jazzband/django-pipeline,beedesk/django-pipeline,d9pouces/django-pipeline,d9pouces/django-pipeline