Provide Package Drone command line tools

[CptMauli]

Provided that there is a REST API, create some tooling around it. It shall make it very easy to list, download and upload artifacts, as well retrieving metadata.

Two immediate use cases which come to my mind that it should support using Package Drone in a continuous build environment and some sync tooling, à la reprepro to mirror apt/yum repositories in a very easy and flexible way.

[ctron]

There already is a Jenkins Plugin available: https://wiki.jenkins-ci.org/display/JENKINS/Package+Drone+Plugin