Merge remote-tracking branch 'edx/master' into opaque-keys-merge-master

Conflicts:
	cms/djangoapps/contentstore/tests/utils.py
	cms/djangoapps/contentstore/views/import_export.py
	cms/djangoapps/contentstore/views/tests/test_import_export.py
	common/djangoapps/student/views.py
	lms/djangoapps/class_dashboard/dashboard_data.py
	lms/djangoapps/instructor/views/instructor_dashboard.py
	lms/static/js/staff_debug_actions.js
	lms/templates/notes.html
	lms/templates/staff_problem_info.html