Python fix + cleanup

[wagoodman]

This isn't associated with any particular issue, and I didn't think it would be helpful creating an issue + PR for each of these fixes, so I made a general cleanup PR. Let me know if this is bothersome and I can break it up. Here is the summary of changes:

• There is a json syntax error in the version.json and the json package was misused, both causing a critical failure on startup.
• Looks like unittest won out over tox, so I removed tox references and updated the Makefile with the right test cmds
• Updated the examples to be generally runnable + show verbose output. With simple.py only one entrypoint was chosen given that there is a web.py there to illustrate how to use metaparticle with port requirements.
• The logger names for the runner and builder have been changed to the modules parent name to be more generic. E.g. instead of metaparticle_pkg.runner.docker_runner it is just metaparticle_pkg.runner since only one runner can be used at a time, and changing runners shouldn't involve a code change to see the correct logs.
• I wasn't able to reproduce https://github.com/docker/docker-py/issues/300 exactly as the docker_runner suggested, however, I believe it was a misdiagnosis. Without a tty in the container the buffered output that python defaults to will not be shown (so nothing was visible from a docker logs -f ...). The easy fix is to use unbuffered python (via the -u switch on the entrypoint in the Dockerfile).

[brendandburns]

THis looks great, thanks! I'll merge it into my local dev and test, and then merge to master assuming things look good.

Thanks Again.

[tomkukral]

Good job! Thanks for fixing my mistakes. :+1:

[brendandburns]

Thanks!