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.
Well, You know the module name anyway, because you call the `install()` function with this argument. And IMHO, the module name should be part of it's message.
Also, the current implementation overrides the `__init__()` method, but does not call the superclass' `__init__()`, which should not happen.