Homestyx hydra

R1:f5ea5ba9fe7b

Simplify Countdown mailtags

Summary: These were a little silly, simplify them

Test Plan: New countdown, edit preferences, etc.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D13888
Repository: R1 hydra
Commit Date: Aug 17 2015