Merge pull request #1529 from edx/flowerhack/feature/refunds-for-certificates

common/djangoapps/course_modes/models.py

common/djangoapps/course_modes/tests/factories.py

common/djangoapps/course_modes/tests/test_models.py

common/djangoapps/student/models.py

common/djangoapps/student/tests/tests.py

common/djangoapps/student/views.py

lms/djangoapps/courseware/tests/test_access.py

lms/djangoapps/shoppingcart/models.py

lms/djangoapps/shoppingcart/tests/test_models.py

lms/templates/dashboard.html

lms/templates/dashboard/_dashboard_course_listing.html