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.
Hmm, I know I did the same, but somehow I think i'd be cooler if this function returned unmet dependencies as a list. Nevertheless, that probably can be postponed until v2.