Allow repositories to be deleted using ./bin/remove.

Summary: Currently, repositories can be deleted using ./bin/repository delete. It makes sense to expose this operate to the ./bin/remove script as well, for consistency.

Test Plan: Deleted a repository with ./bin/remove rTEST.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D9350