Rename Support Sherpa to Support Sheepdog
Rename Support Sherpa to Support Sheepdog

Summary: See: https://app.asana.com/0/27216215224639/40502330341458

Test Plan:
Cross fingers, mostly. Will test adding asana tasks with

    sheepdog: Halp!

Once this is landed and I reboot culture cow on toby.

Reviewers: pamela, csilvers

Reviewed By: pamela, csilvers

Subscribers: ethan, pamela

Differential Revision: https://phabricator.khanacademy.org/D19289

Khan/culture-cow,Khan/culture-cow