Mp3doer 0.2

New:
- Config window is now working (target dir, use month dir and script all work)
- Bug fix
- Download album art using an external command line tool (for instance, https://sourceforge.net/projects/album-art/\). Details will follow soon.

TODO:
TODO
- add open target dir button
- add why? button > shown window with a little help + contact
- add a 'done' message (for 3 secs) in the main window
- support for compilation albuns + album artist tag
- when only two artists are recognized, use "artist1 & artist2" as album artist
- what about soundtracks + OST + BSO?
- decorate window?
- show console option doesn't do anything yet

BUG: closing settings window does not reset config