Fix bug when SALESFORCE_DB_ALIAS not defined in settings.py
Fix bug when SALESFORCE_DB_ALIAS not defined in settings.py

SALESFORCE_DB_ALIAS is listed as an optional settings variable.

Mimic the use of sf_alias in router.py.

chromakey/django-salesforce,chromakey/django-salesforce,django-salesforce/django-salesforce,django-salesforce/django-salesforce,philchristensen/django-salesforce,django-salesforce/django-salesforce,chromakey/django-salesforce,philchristensen/django-salesforce,hynekcer/django-salesforce,philchristensen/django-salesforce,hynekcer/django-salesforce,hynekcer/django-salesforce