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

Merge pull request docker#523 from docker/1.1.0-release

1.1.0 release

Fix pep8 error