chore(router): Updated nginx to 1.6.2

This fixes a security issue in 1.6.1 http://nginx.org/
Merge pull request #1898 from johanneswuerbach/patch-5

chore(router): Updated nginx to 1.6.2
ref(builder): use ubuntu:14.04 as Dockerfile base image
ref(cache): use ubuntu:14.04 as Dockerfile base image
ref(controller): use ubuntu:14.04 as Dockerfile base image
ref(database): use ubuntu:14.04 as Dockerfile base image
ref(database): update postgres user uid/gid in confd templates
ref(logger): use ubuntu:14.04 as Dockerfile base image
ref(registry): use ubuntu:14.04 as Dockerfile base image
ref(router): use ubuntu:14.04 as Dockerfile base image
ref(tests): use ubuntu:14.04 as Dockerfile base image
chore(pip): update pip installs to 1.5.6
ref(data): use ubuntu:14.04 as Dockerfile base image