Switch django-cors-headers to django-cors-middleware (#5)
Switch django-cors-headers to django-cors-middleware (#5)

The original django-cors-headers module at
https://github.com/ottoyiu/django-cors-headers seems to have been
unmaintained for two years.

There is a more recent fork at
https://github.com/zestedesavoir/django-cors-middleware which is
currently maintained and supports the new Django 1.10 middleware.

Switch to this package is encouraged because the former one does not
seem maintained anymore.
gpul-org/xea-core