Re #2137 Note about vagrant dns in the test documentation
Add Stackbrew.
Add error checking and error messages
Update hack/release.sh process to automatically invoke hack/make.sh and bail on building/testing issues
Merge pull request #2253 from jpetazzo/infrastructure-docs

Try a different presentation of infrastructure documentation.
clean split between errors and output. JSON output always valid
Remove race condition caused by double-destroy in 2 tests
Don't add /.docker-id to the container filesystem
devmapper: Rename DeviceSetDM to DeviceSet
Clean up build warnings. Remove redundant files.
devicemapper: Add fixme
Hack: don't run integration tests in /var/lib/docker/unit-tests; add missing cleanups in a few tests
Hack: fix tests which didn't cleanup properly
hack: fail tests if there are leftover temp files before or after
Merge remote-tracking branch 'alexlarsson/fix-tar-leak' into dm-correct
Merge remote-tracking branch 'alexlarsson/dm-readonly-images' into dm

Conflicts:
	devmapper/deviceset_devmapper.go
Work around an exotic bug affecting Docker-in-Docker + systemd.
devmapper: rename deviceset_devmapper.go to deviceset.go
Use heredoc to make expect script more clear
Merge pull request #2269 from alexlarsson/dm-blocksize

devmapper: Use a smaller blocksize for the thin-pool