Support the Jaikoz 'artists' tag, with help from @night199uk and @zas
Merge branch 'master' of github.com:musicbrainz/picard into artists-tag
Merge branch 'master' of github.com:musicbrainz/picard into artists-tag
Merge branch 'master' of github.com:musicbrainz/picard into artists-tag
Update NEWS.txt
Merge branch 'master' into artists-tag

Conflicts:
	NEWS.txt
Merge pull request #188 from mwiencek/artists-tag

Support the Jaikoz 'artists' tag, which stores individual artist names