Feature/fedimg meta

This is my go at some meta code for [Fedimg](https://github.com/fedora-infra/fedimg). It works with [this file in Fedimg](https://github.com/fedora-infra/fedimg/blob/develop/fedimg/messenger.py). Let me know if anyone has improvements or suggestions to either file.
For ``__docs__``, can you link to that "koji plan" wiki page?