[HOTFIX] add a default XML serialization if the 'data' field is empty or None. So...

add a default XML serialization if the 'data' field is empty or None. Some XModules now - like video XModule - do not have XML set in the 'data' field

Fix section release acceptance test failure.

Studio internationalization

[STUD-431] Seems like the Edit/QA links in LMS are triggered by a ENABLE_LMS_MIGRAT...

Add management command to Studio for exporting all courses; useful for periodic backups of course content in Studio

[STUD-406] Fix/cdodge/unescape quote strings

change serialize_field to check for type. If value is a string, simply return that, otherwise do a json.dumps

vagrant: Always mount `node_modules` folder after Vagrant NFS mount

Added documentation to new acceptance test features and techniques

Bugfix for stanford shib

Fixed a spelling mistake. LMS-605

Jonahstanley/refactor global to world

Seems like the Edit/QA links in LMS are triggered by a ENABLE_LMS_MIGRATION feature flag. So when running as mongo-backed, set that to False

Tidy up argument parsing in release email script

Add a 'string literal' serialization method and use it in the lambda function mapping table when the value to xml serialize is of basestring type. Also a couple of drive-by pep8 fixes.

Fix alt text for the login page: LMS-600

Jonahstanley/fix flakey video test