docs: Fix typo
mpd: Accept listall and listallinfo without the URI argument
docs: Add Mopidy-Subsonic extension
mpd: Don't decide the remove action

Those three lines shouldn't be there. That is tracklist/playback logic, not frontend logic. Indeed, care is already taken in core =)
Merge pull request #505 from txomon/patch-1

mpd: Don't decide the remove action