Modules installer

This is a simple modules installer (can't handle multiple files, or requirements yet)

It connects to http://jaspermoduleshub.herokuapp.com/

I added a `walk_packages` on `brain.py` so that modules can be installed in subfolders.
Isn't argparse a 3rd party module? Not sure. If we're expecting people to use at least Python 2.7, it's not, but then we should remove it from `requirements.txt`.

Anyway, I'd rather put this import some lines below (i.e. between `urllib` and `pip`).