add license to flac metadata

incantation:
$ for f in */*.flac; do metaflac --set-tag=LICENSE='http://creativecommons.org/licenses/by-nc-sa/3.0/' --preserve-modtime $f; done
$ for d in Neutral Obadiah Poker Poppy Spike; do touch -t 10100000 $d; tar cf $d.tar $d; done
Merge remote-tracking branch 'refs/remotes/origin/master'