Docker Swarm 1.8

🛰 New features and improvements

• Added a DNS and DNS Search Domain field to use in the container (thanks @Crocmagnon)
• Use agent.jar instead of the deprecated slave.jar
• Updated insecure depencencies
• Code cleanups
• Documentation improvements

🐞 Bug fixes

• Use more unique name for the agent name to prevent collisions (thanks @smhc)