Use getProductionURI instead of getURI for emails.

Summary: 'TASK DETAIL' links point to the non-production uri. Our daemons run in an environment that uses different baseUrl because we can't use https locally (https is provided by our load balancers)

Test Plan: check emails generated with a non-production environment. See that the TASK DETAIL link points to production url.

Reviewers: epriestley

Reviewed By: epriestley

CC: aran, Korvin

Differential Revision: https://secure.phabricator.com/D3877