docs(readme): add waffle.io badge
docs(readme): add IRC badge
ref(Dockerfile): remove supervisord
docs(readme): add GA beacon
docs(readme): move GA beacon
docs(readme): fix GA beacon
ref(Dockerfile): remove software-properties-common
ref(Dockerfile): remove nano
ref(Dockerfile): remove logrotate
feat(Dockerfile): add etcdctl
docs(readme): update README.md
feat(Dockerfile): add gettext-base package for envsubst command
docs(contributing): add CONTRIBUTING.md
docs(dco): add DCO