dockerfile: upgrade to `sameersbn/ubuntu:14.04.20150816
dockerfile: upgrade to `sameersbn/ubuntu:14.04.20150816

boky8/docker-postgresql,mental-docker/postgresql,sameersbn/docker-postgresql,markrowsoft/docker-postgres-bdr,bokysan/docker-postgresql,crobays/docker-postgresql,logandg/docker-postgis,arkkanoid/docker-postgresql