cps-daily-deal worker.
Send email:  GET /run?date=YYYY-MM-DD&dry=1
Flip prices: GET /flip?date=YYYY-MM-DD&dry=1
Opt-in:      GET /deal-optin?e=BASE64&t=HMAC
Feed:        GET /feed.json (today and the next 14 days, for Plivvy)