Added new field "Paused"
Updated test to expect "docker.com" not "docker.io" (as that is not on the site anymore)
Fixed to handle no Content-Type (which happen in the case of a 304 response)
Added a method to "cleverly" figure out the Docker url.
It tries "-Ddocker.url" first, then "$DOCKER_HOST", then "http://localhost:4243" (the old Docker port), and finally "http://localhost:2375" (the new Docker port).
Updated documentation with "busybox" repository information.
Added "relativePath" to "parent"; should not matter when building the project on it's own, but enables a "workspace" maven project to use "docker-java" as a module.