Merge pull request #388 from dzhuang/refactor_tests_for_multiple_courses

course/admin.py

course/auth.py

course/flow.py

course/grading.py

...tions/0107_rename_flowpagedata_ordinal_to_page_ordinal.py

course/migrations/0108_alter_page_ordinal_verbose_name.py

...ations/0109_add_manage_authentication_tokens_permssion.py

course/models.py

course/templates/course/flow-confirm-completion.html

course/templates/course/flow-page.html

course/templates/course/grade-flow-page.html

course/templates/course/gradebook-single.html

course/utils.py

locale/de/LC_MESSAGES/django.po

locale/zh_CN/LC_MESSAGES/django.po

relate/urls.py

tests/base_test_mixins.py

tests/test_auth.py

tests/test_content.py

tests/test_enrollment.py