Fix queryset iterator to iterator class compatible with 1.8 - 1.11
Fix queryset iterator to iterator class compatible with 1.8 - 1.11

hynekcer/django-salesforce,hynekcer/django-salesforce,django-salesforce/django-salesforce,hynekcer/django-salesforce,django-salesforce/django-salesforce,django-salesforce/django-salesforce