Working on Lexer Rules
Spec out ADT
Implement Note, Voice and Lyric.  Write VERY basic tests
Merge branch 'master' into implement_ADT
Merge branch 'LexerRules' of github.com:Jdhaimson/abcmusicplayer
Merge branch 'SequencePlayerTest' of github.com:Jdhaimson/abcmusicplayer
Merge branch 'implement_ADT'
Revert "Merge branch 'implement_ADT'"

This reverts commit 93c0992ab0345dcf117f949887845ed390b7a2b0, reversing
changes made to 5e4e4a3bf026d7de6371b98ade2bd7e07ee88342.
Revert "Merge branch 'SequencePlayerTest' of github.com:Jdhaimson/abcmusicplayer"

This reverts commit 5e4e4a3bf026d7de6371b98ade2bd7e07ee88342, reversing
changes made to 88671f89b634a0be8e5d6fd8c4da87cd2a88f59b.
Revert "Merge branch 'LexerRules' of github.com:Jdhaimson/abcmusicplayer"

This reverts commit 88671f89b634a0be8e5d6fd8c4da87cd2a88f59b, reversing
changes made to afd431a78dd82759d7d890f735a45825485a6d20.