Currently the documentation states that `docker_swarm` is an acceptable value for the Docker Swarm provider.
However, the code actually uses `swarm`.
This changes adds `docker_swarm` as a supported provider alias for docker swarm.
Closes#279
the delimiter configuration property for kubernetes allows you to change the default "_" delimiter.
By specifying "/" or "." as a delimiter you ensure that you won't collide with objects names that contains the default delimiter "_".
Fixes#207
