v0.15.1

• fix unable to scan music after database reset (regression in v0.15.0) (#774)
• Ampache:
  • fix handshake and ping not working on JSON API (#768)
  • fix handling of offset argument in the action playlists (#768)
  • fix action tags to return the genres in alphabetical order (regression in v0.15.0)
  • provide limited support for actions download and stream (#768)
• Subsonic:
  • fix an error being logged if getRandomSongs called on an empty library (#775)
  • fix method getGenres to return the genres in alphabetical order (regression in v0.15.0)
• add optional argument --folder=<target> to occ music:scan to scan only the specified folder (#771)