Wait for SSH port to be available on docker slave.  If using supervisor,
periodically the SSH port is not available when the SSH slave tries to
start and slave launch fails, this seems to solve that.
Merge pull request #126 from gilbode/wait_for_ssh_port

Wait for SSH port to be available on docker slave.  If using supervisor,
Fixes issue#77: "Docker Cloud name" parameter will be stored
Merge pull request #127 from akoch/issue-77

Fixes issue#77: "Docker Cloud name" parameter will be stored
pass environment additions to docker container
Merge pull request #128 from alari/master

pass environment additions to docker container