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/~~
assets shouldn't be a runtime dependency though.  This may work, but it's not optimal.  Ideally we'd compile the plugin assets at *build* time, which means making it a build time dependency, precompiling the plugin assets and then including public/assets/plugin_name in the package files, rather than rebuilding assets on the system.