Add support for stopping containers from configured images.

If docker:stop is called standalone, it will try to stop all docker containers, which were started for all configured images. The set of images can be restricted by providing a system property docker.image with a (comma separated) list of image names or aliases.
Beautify image description in output
Add "remove" goal for cleaning up
Update version number
[maven-release-plugin] prepare release v0.10.3
[maven-release-plugin] prepare for next development iteration
Merge branch 'master' of https://github.com/rhuss/docker-maven-plugin

Conflicts:
	src/main/java/org/jolokia/docker/maven/StopMojo.java