Use the correct Content-Type for the Aphlict status route
Summary: The /status/ route for the Aphlict server returns JSON.
Test Plan:
> curl -I http://127.0.0.1:22281/status/ HTTP/1.1 200 OK Content-Type: application/json Date: Fri, 02 Jan 2015 13:08:34 GMT Connection: keep-alive
Reviewers: epriestley, #blessed_reviewers
Reviewed By: epriestley, #blessed_reviewers
Subscribers: Korvin, epriestley
Differential Revision: https://secure.phabricator.com/D11144