Add primitive virtualenv settings.

[mattdeboard]

This reads a couple of config settings from a JSON/CSON file. This is just a small start, and probably the easiest possible part, toward per-directory virtualenv config. The hard stuff I will leave to the more capable & experienced.

I can think of a billion problems with this approach I chose here, but I wanted to get something workable as maybe like a starting point or something.

Refs #12

[mattdeboard]

Not sure why the build is failing. Is it a problem in the code? Based on the text of the error, it doesn't seem to be.

[tinloaf]

No, that's just me derping up the git submodule... will fix that tomorrow.

[qnub]

Absolutely required manual virtualenv setting for autocomplete. I save virtualenv in .env in root folder of each project, so it will be perfect if i can set this path in some config file for each project.

And thank you for awesome python autcomplete package!