initial commit for new version
drop ruby 1.9 support
delete obsolete files
bump to 0.5.0
more purging of obsolete files
[spec] added util_spec
[utils] fixed get_int_pair when receiving int pairs
[attributes] moved audio_prop_reader into base class
[taggers] added MP4Tagger
[taggers] added BaseTagger
[mp4] cleaned up empty list handling
[project] removed mp3info dependency
split replaced #track_num with #track_number and #total_tracks; #disc_num with #disc_number and #total_discs
[spec] added tests for consistency*m4a
[project] remove idea files
[taggers] moved #method_missing to base
[MP3Tagger] fixed #musicbrainz_recording_id
[MP4Tagger] added missing attributes
updated README
added wiki attributes table script