initial implementation of ColorConverter.
add Color.equals.
tests for ColorConverter.js.
update style based on @mrdoob's suggestion here: https://github.com/mrdoob/three.js/pull/3109#issuecomment-13915971
remote flyweight pattern in ColorConverter.toHSV per @zz85's suggestion here: https://github.com/mrdoob/three.js/pull/3109#issuecomment-13923276
remove stray console.log() from Line3 unit test.
Merge remote-tracking branch 'bhouston/color-converter' into dev