Merge branch 'master' into split_stdout_stderr_run-feature

AUTHORS

CONTRIBUTING.md

MAINTAINERS

SPECS/data-volumes.md

api.go

api_test.go

archive.go

auth/MAINTAINERS

builder_client.go

buildfile.go

buildfile_test.go

commands.go

contrib/MAINTAINERS

contrib/docker-build/MAINTAINERS

docs/MAINTAINERS

docs/sources/api/MAINTAINERS

docs/sources/api/docker_remote_api.rst

docs/sources/contributing/contributing.rst

docs/sources/installation/binaries.rst

docs/sources/installation/ubuntulinux.rst