R1:82edde8876ee

Add MAILTAGs to Badges

Summary: Still doesn't mail yet, but the settings now show up.

Test Plan: View email settings, see Badges options.

Reviewers: eadler, epriestley

Reviewed By: eadler, epriestley

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D13712