Look through the code, you will get the idea pretty quick. I will put more instructions in here soon, pinky swear.
In the mean time bower install color-scale to get it in there. And then in your gruntfile.js add the following when using grunt-sass:
options: {
includePaths: [
'./bower_components/color-scale'
]
}Then import into your primary Sass manifest file:
@import "color-scale";