This feature adds the capability to stop unregistered running instances upon startup.
Previously, you had to stop running instances manually or issue an initial request that will shut down instances afterwards.
With this change, all discovered instances will be shutdown. They need to be registered using labels. E.g.: sablier.enable=true
Fixes#153
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
