plugins:foreman_docker - Release 0.2.0

https://rubygems.org/gems/foreman_docker/versions/0.2.0

Scratch build - ~~http://ci.theforeman.org/view/Packaging/job/packaging_build_deb_plugin/263/~~
~~http://ci.theforeman.org/view/Packaging/job/packaging_build_deb_plugin/264/~~
~~http://ci.theforeman.org/job/packaging_build_deb_plugin/266/~~
~~http://ci.theforeman.org/job/packaging_build_deb_plugin/267/~~
Doing this after install also means that the user gets a local copy of the original assets (due to installing foreman-assets), and of the precompiled version, which isn't good as it can break upgrades IME.