tangentlabs/django-oscar — pull request #904 by izidormatusov (2013-10-17 10:30:31+00:00)
Title: Use better exception for AUTH_USER_MODEL

If AUTH_USER_MODEL is improperly configured as 'project.customer.User',
the error is:

`ValueError: too many values to unpack`

Use rather standard Django's error:

`ImproperlyConfigured: AUTH_USER_MODEL must be of the form 'app_label.model_name'`