Adding support for id3 TPUB and ogg/flac PUBLISHER. These tags reference the
record label that published the album/recording.

ID3 v2 -> http://id3.org/id3v2.3.0
Vorbis -> https://xiph.org/vorbis/doc/v-comment.html and http://age.hobba.nl/audio/mirroredpages/ogg-tagging.html . Note that there is discrepency with regards
to the Vorbis container. Original specs state ORGANIZATION is the noted tag, but
it seems the community has standardized on PUBLISHER (which has been used here).
updating flac and ogg tests to capture Publisher()
reverting import path for taggo example script.