Set celerity.minify true in production environments.
Summary: I haven't been able to understand why this isn't set by default in production environments (since it is recommended to do so anyway).
Test Plan: N/A
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: epriestley, Korvin
Differential Revision: https://secure.phabricator.com/D8743