Replacing DOCKER_HOST varibale with RABBITMQ_HOST

Hi,
I had hard times getting my instance running on my VM. Since my docker instances require a port in DOCKER_HOST. See documentation for more info: 
https://docs.docker.com/reference/commandline/cli/ ("$ export DOCKER_HOST="tcp://0.0.0.0:2375")

So I've dug in a bit on your launcher.sh script and replaced the DOCKER_HOST with a RABBITMQ_HOST since your script requires an IP without ports to work.

My setup is a VM with Ubuntu-Server 14.04 with the lastest lxc-docker version 1.1.2 d84a070.
I executed all commands on root level after getting root rights with '$ sudo -i'.