Implement /on/github/foo/public.json per #876
Implement /on/github/foo/public.json per #876

eXcomm/gratipay.com,gratipay/gratipay.com,mccolgst/www.gittip.com,mccolgst/www.gittip.com,studio666/gratipay.com,gratipay/gratipay.com,studio666/gratipay.com,mccolgst/www.gittip.com,eXcomm/gratipay.com,gratipay/gratipay.com,eXcomm/gratipay.com,studio666/gratipay.com,studio666/gratipay.com,eXcomm/gratipay.com,gratipay/gratipay.com,mccolgst/www.gittip.com