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.
I'd rather do something like:
```Python
raise ModuleInstallationError("Module '%s' not found" % module)
```
and then replace the custom `ModuleInstallationError` with this:
```Python
class ModuleInstallationError(Exception):
    pass
```