[close #5919] Update expiration_date always and notify if Facebook returned shorter date.
[close #5919] Update expiration_date always and notify if Facebook returned shorter date.

Change-Id: I1d7ba548aa7a67e5e73228e9c788aa6607a8e708
Reviewed-on: http://review.pozytywnie.pl:8080/19734
Tested-by: Jenkins
Reviewed-by: Tomasz Wysocki <dd7daed03936e0c371e2c3aa653cd5b196895201@pozytywnie.pl>

pozytywnie/django-facebook-auth,jgoclawski/django-facebook-auth,jgoclawski/django-facebook-auth,pozytywnie/django-facebook-auth