Add new phabricator file storage config

Summary: It's probably my fault that the old (broken) configuration never made it into this repo; my mistake might have even been caught in code review. Oops. :( This should be better.

Test Plan: Ran these commands on toby and they didn't give errors.

Reviewers: csilvers

Reviewed By: csilvers

Differential Revision: http://phabricator.khanacademy.org/D9814