#131 Pad cover art with black OR crop

[kabutar]

When padding cover art images that are not square, the white bars are very jarring. It would be great if possible to include options to:

a) pad with black
AND/OR
b) crop (I believe this is what iTunes does, but I'm not entirely sure, so I would hate to end up with cover art that is missing half the image if I'm wrong!)

Thanks :)