Plugins » Docker

Fixes #11984 - Update the plugin to use the latest gettext from core,
and re-extract the strings.

Once this is merged, the project needs to be added to transifex.

fixes #8100 - make engine and asset precompilation name consistent

Ensures that when precompiling, both the assets and the manifest end up under
'foreman_docker' rather than one ending up under 'foreman_docker_engine'. Not
much functional effect except it keeps everything in one dir.

Refs #7642 - Create docker image and tag models

Clean up Gemfile and gitignore

initial commit