[maven-release-plugin] prepare for next development iteration
add travis-ci config
test: pull busybox instead of ubuntu
travis: build status image
use iana port 2375
use rest api v1.12
add docker version request
Merge pull request #3 from spotify/dano/rest-v1.12

use rest api v1.12
Merge pull request #4 from spotify/dano/version

add docker version request
Merge pull request #2 from spotify/dano/port-2375

use iana port 2375
prepare for version 2.1.0
[maven-release-plugin] prepare release 2.1.0