Allow folder selection for custom music, as well as a shuffle option

[logangbrown]

I love the simplicity of the app, and I like the custom music options, but I'd like to be able to have a little more variety in the songs that are played. It would be nice to be able to choose a folder that has songs in it instead of just a song file, that could be played through. Additionally, being able to enable a random/shuffle setting for the folder would be perfect to allow for a mixture of songs to keep the same song from becoming overplayed.