Guitar scales!

An implementation of a guitar fretboard, and a multitude of scales in d3. Based on code written by Austin Whittier here. It might take a second to load. I wrapped the fretboard code up into a class, so it may(?) be easier to use elsewhere if people want to. The code to get the dropdowns working is a bit knarly, and a bit more work may be done on it yet. See the source code here!