Merge branch 'master' into if_http

.gitignore

.gitlab-ci.yml

.travis.yml

README.rst

accounts/admin.py

accounts/migrations/0001_initial.py

accounts/migrations/0003_user_schema_migration.py

accounts/migrations/0007_migrate_user_status_data.py

accounts/migrations/0011_remove_user_git_auth_token_hash.py

accounts/models.py

accounts/utils.py

accounts/views.py

appveyor.yml

bin/relate

contrib/course-material-tree/make-tree-html

contrib/get_nbconvert_minfied_css.py

course/admin.py

course/analytics.py

course/api.py

course/apps.py