Detecting mp3 files for importing albums

[bentsherman]

Currently the import album API endpoint uses the names of mp3 files in RIPPED_MUSIC/albums/ to detect albums to import. This method works well for ripped CDs where we control the naming scheme, but for digital downloads, the files usually don't have this format. Therefore, we should either create a script to batch rename mp3 files or just change the PHP code to use the mp3 metadata to detect albums.

This a pretty significant issue because currently it is very difficult to import digital downloads.