Replaced use of while with modulus in music.intToNote()
Replace use of string.sub with .match in music.interval()
Removed redundant checks in music.interval()'s arg assert
Replaced while loop with modulus in music.interval()
Replaced all calls to noteAsInt() -> noteToInt()
Replaced all calls to intAsNote() -> intToNote()
Merge pull request #1 from rxi/master

Clean ups and fixes from rxi.