Migrating from 4.0.2 to 4.0.3

Fixes

• Fix crash with angular variable expansion and mathjax/markdown - https://github.com/devilry/devilry-django/issues/1130.

Backup database and files

BACKUP. YOUR. DATABASE. AND. FILES.

Update devilry to 4.0.3

Update the devilry version to 4.0.3 as described in Update Devilry.