Note expression as sharp/flat is switched based on input

[raff]

The option to return flats is switched based on the input request. E.g. if the requested chord contains "flats" the output notes should all be expressed with flats.

For example:

$ go run music.go -c "CMb5b7"

returns:

root: C
tones:
1: C
3: E
 5: F#
 7: A#

should return:

root: C
tones:
1: C
3: E
 5: Gb
 7: Bb

[charneykaye]

Thanks @raff !

[charneykaye]

I've edited this issue to reflect that it has an underlying refactoring (which I like very much) wherein note expression is switched to be either "sharps" or "flats".

[charneykaye]

@raff here is my implementation of your request. Great idea! https://github.com/go-music-theory/music-theory/pull/15/files

[charneykaye]

Now included in master. The change will make it into release 0.0.3. Example:

$ music-theory chord Bb7
root: Bb
tones:
  1: Bb
  3: D
  5: F
  7: Ab

$ music-theory chord A#7
root: A#
tones:
  1: A#
  3: D
  5: F
  7: G#

[raff]

Great! Thanks!!!!