Fix logout on password change in Django 1.7+
Fix logout on password change in Django 1.7+

Fixes #143.

For more information:
https://docs.djangoproject.com/en/1.7/topics/auth/default/#session-invalidation-on-password-change

pinax/django-user-accounts,jacobwegner/django-user-accounts,nderituedwin/django-user-accounts,jpotterm/django-user-accounts,mgpyh/django-user-accounts,mentholi/django-user-accounts,jawed123/django-user-accounts,GeoNode/geonode-user-accounts,rizumu/django-user-accounts,ntucker/django-user-accounts,mysociety/django-user-accounts,osmfj/django-user-accounts,osmfj/django-user-accounts,rizumu/django-user-accounts,mysociety/django-user-accounts,GeoNode/geonode-user-accounts,jpotterm/django-user-accounts,jmburbach/django-user-accounts,jmburbach/django-user-accounts,ntucker/django-user-accounts,jawed123/django-user-accounts,pinax/django-user-accounts,jacobwegner/django-user-accounts,nderituedwin/django-user-accounts,mentholi/django-user-accounts