Create role

src/account/migrations/0002_profile_role.py

src/account/models.py

src/account/serializers.py

src/homework/migrations/0002_auto_20190105_1922.py

src/homework/models.py

src/role/urls.py

src/stats/migrations/0002_auto_20190105_2221.py

src/stats/migrations/0003_auto_20190105_2227.py

src/stats/migrations/0004_auto_20190105_2227.py

src/stats/models.py