change s3 path tests to new format, ignore processor test if slimmer is not installed
change s3 path tests to new format, ignore processor test if slimmer is not installed

mntan/django-mediasync,mntan/django-mediasync,sunlightlabs/django-mediasync,sunlightlabs/django-mediasync,sunlightlabs/django-mediasync,mntan/django-mediasync