Merge pull request docker#66 from n4ss/release-v0.5.1

Update version tag to v0.5.1

Merge pull request docker#52 from jeanlaurent/run-test-on-release

Clean and run test before osx release

Merge pull request docker#43 from jeanlaurent/windows-makefile

Add .exe to windows Makefile target

Merge pull request docker#40 from ebriney/osx10.10-10.11-compatibility

Add cgo flags to support older version of OSX (10.10, 10.11)

Merge pull request docker#39 from docker/release-v0.4.0

Prepare v0.4.0 release

Release v0.3.0.

Signed-off-by: David Calavera <david.calavera@gmail.com>

Release v0.2.0.

Signed-off-by: David Calavera <david.calavera@gmail.com>

Make sure we build release artifacts and they are uploaded properly.

Signed-off-by: David Calavera <david.calavera@gmail.com>