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.
The idea is that the `install` function defines the structure of what is going to happen, and then the internal functions do the actions. You're right, from a computation point of view, having a function that only does one call is not really that necessary. But it helps the reader understand at a glance what is happening in every step, and allows him to maintain the same level of abstraction while reading the whole function.