Merge remote-tracking branch 'origin/master' into feature/alex/poll-merged

Conflicts:
	cms/djangoapps/contentstore/tests/test_contentstore.py
	cms/djangoapps/contentstore/views.py
	cms/templates/edit_subsection.html
	cms/templates/overview.html
	cms/templates/unit.html
	cms/templates/widgets/header.html
	common/djangoapps/course_groups/tests/tests.py
	common/lib/xmodule/setup.py
	common/lib/xmodule/xmodule/capa_module.py
	common/lib/xmodule/xmodule/combined_open_ended_module.py
	common/lib/xmodule/xmodule/course_module.py
	common/lib/xmodule/xmodule/js/src/.gitignore
	common/lib/xmodule/xmodule/mako_module.py
	common/lib/xmodule/xmodule/modulestore/mongo.py
	common/lib/xmodule/xmodule/modulestore/store_utilities.py
	common/lib/xmodule/xmodule/modulestore/xml_exporter.py
	common/lib/xmodule/xmodule/open_ended_grading_classes/combined_open_ended_modulev1.py
	common/lib/xmodule/xmodule/open_ended_grading_classes/controller_query_service.py
	common/lib/xmodule/xmodule/open_ended_grading_classes/open_ended_module.py
	common/lib/xmodule/xmodule/open_ended_grading_classes/openendedchild.py
	common/lib/xmodule/xmodule/open_ended_grading_classes/self_assessment_module.py
	common/lib/xmodule/xmodule/peer_grading_module.py
	common/lib/xmodule/xmodule/tests/__init__.py
	common/lib/xmodule/xmodule/tests/test_capa_module.py
	common/lib/xmodule/xmodule/tests/test_self_assessment.py
	common/lib/xmodule/xmodule/x_module.py
	lms/djangoapps/courseware/grades.py
	lms/djangoapps/courseware/models.py
	lms/djangoapps/courseware/views.py
	lms/djangoapps/open_ended_grading/tests.py