Merge branch 'master' into feature/actions

.travis.yml

CODEOWNERS

MAINTAINERS

README.md

cmd/main.go

docs/administrator.md

docs/developer.md

docs/reference/cluster_manifest.md

docs/reference/command_line_and_environment.md

docs/reference/operator_parameters.md

docs/user.md

glide.lock

glide.yaml

hack/custom-boilerplate.go.txt

hack/update-codegen.sh

hack/verify-codegen.sh

manifests/configmap.yaml

manifests/operator-service-account-rbac.yaml

manifests/postgres-operator.yaml

manifests/postgresql-operator-default-configuration.yaml