Merge branch 'master' into feature/cdodge/cms-master-merge3

Conflicts:
	common/lib/xmodule/xmodule/course_module.py
	common/lib/xmodule/xmodule/modulestore/mongo.py
	common/lib/xmodule/xmodule/modulestore/search.py
	common/lib/xmodule/xmodule/modulestore/xml.py
	doc/development.md
	lms/envs/common.py