Now, a course can be exported to JSON (without images)
Save course.json and media files with paths relatives to media_root in a tgz bundle
Create import_units commands, to import unit from one tar.gz
Implemented import_units, and fix typo in export_course
Add conversion factor in option position translation to changes in views from player
Command to create a csv per course with firtname, lastname, email, with all csv files per course in one ZIP
Fix utf8 problems
make translate options during unit import optional
Include the translation option positions way
Merge branch 'course-export'