v0.2.0

feat(trackfs): Support WAVE files with accompanying cue-sheets (gh-8) (#11)

To introduce WAVE support a few breaking changes got introduced:

• New naming scheme for virtual files; in case you have indexed the virtual
  filesystem in some media-server you have to re-index it
• parameter keep-flac-cue got renamed to keep-album
• parameter extension now has to be a regular expression
• trackfs now also uses album meta-data from the cue-sheet to backfill
  missing entries in the album file
• basic support for album-art in accompanying jpg files