Python dox

A project inspired by tox, but in addition to virtualenvs also handles docker containers. (so that you can test in various linux distrobutions). It seems natural to use tox inside dox (so every supported version of python is tested on every OS that you want).

NOTE:

I still recommmend using tox instead. Docker only supports linux, which makes it kind of useless.

#### ./dox.yml
image:                 ## images to execute code in
	- ubuntu:trusty
	- ubuntu:16.04

commands: |
  pip install . -r test-requirements.txt
  tox

dox --images ubuntu:trusty,ubuntu:16.04    ## you can also specify exactly which images to test in
                                           #  using a comma-separated list on the CLI