add address and emergency contact on Registration, update API, TODO tests

oser_backend/core/admin.py

oser_backend/core/migrations/0004_address.py

oser_backend/core/migrations/0005_auto_20180408_1525.py

oser_backend/core/models.py

oser_backend/core/serializers.py

oser_backend/oser_backend/settings/common.py

oser_backend/register/migrations/0006_address.py

oser_backend/register/migrations/0007_auto_20180408_1457.py

oser_backend/register/migrations/0008_auto_20180408_1518.py

oser_backend/register/migrations/0009_auto_20180408_1525.py

oser_backend/register/models.py

oser_backend/register/serializers.py

oser_backend/register/views.py

requirements.txt