Merge pull request docker#801 from docker/1.5.0-release

1.5.0 release

Merge pull request docker#762 from docker/1.4.0-release

1.4.0 release

Merge pull request docker#688 from docker/1.3.1-release

1.3.1 release

Merge pull request docker#671 from docker/1.3.0-release

1.3.0 release

Updated site_url value in mkdocs file

Bump RC

Changelog WIP

Merge pull request docker#582 from docker/1.2.2-release

1.2.2 release

Merge pull request docker#575 from docker/1.2.1-release

1.2.1 release

Merge pull request docker#571 from docker/1.2.0-release

Release 1.2.0