Merge branch 'master' into homework

.circleci/config.yml

README.md

requirements/base.in

requirements/development.in

requirements/development.txt

requirements/production.in

requirements/production.txt

src/account/admin.py

src/account/auth_pipeline.py

src/account/migrations/0011_deadline.py

src/account/migrations/0012_auto_20180125_1957.py

src/account/migrations/0013_auto_20180203_2007.py

src/account/migrations/0014_auto_20180203_2010.py

src/account/migrations/0015_auto_20180203_2014.py

src/account/migrations/0016_auto_20180203_2022.py

src/account/models.py

src/account/serializers.py

src/account/views.py

src/homework/admin.py

src/homework/migrations/0004_auto_20180125_1817.py