Add information about exact origin of the library as per AMO review request

src/lib/hsluv/README.md

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+# HSLuv - Human-friendly HSL
+
+## Installation
+
+Client-side: download [the latest hsluv.min.js](https://github.com/hsluv/hsluv/tree/master/javascript/dist).
+
+Once this module is loaded in the browser, you can access it via the
+global ``window.hsluv``.
+
+Server-side: ``npm install hsluv``.
+
+## Usage
+
+Most functions take tuples, ie: Javascript arrays with three elements.  Make sure you are using
+`func([a,b,c])` and not `func(a,b,c)`. If you are getting NaN for output then this is probably
+the problem.
+
+**hsluvToHex([hue, saturation, lightness])**
+
+*hue* is a number between 0 and 360, *saturation* and *lightness* are
+numbers between 0 and 100. This function returns the resulting color as
+a hex string.
+
+**hsluvToRgb([hue, saturation, lightness])**
+
+Like above, but returns an array of 3 numbers between 0 and 1, for the
+r, g, and b channel.
+
+**hexToHsluv(hex)**
+
+Takes a hex string and returns the HSLuv color as array that contains
+the hue (0-360), saturation (0-100) and lightness (0-100) channel.
+_Note:_ The result can have rounding errors. For example saturation can
+be 100.00000000000007
+
+**rgbToHsluv([red, green, blue])**
+
+Like above, but *red*, *green* and *blue* are passed as numbers between
+0 and 1.
+
+Use **hpluvToHex**, **hpluvToRgb**, **hexToHpluv** and **rgbToHpluv** for
+the pastel variant (HPLuv). Note that HPLuv does not contain all the colors
+of RGB, so converting arbitrary RGB to it may generate invalid HPLuv colors.
+
+For advance use cases, additional functions are avalible:
+
+**hsluvToLch**, **lchToHsluv**
+
+**hpluvToLch**, **lchToHpluv**
+
+**rgbToXyz**, **xyzToRgb**
+
+**rgbToLch**, **lchToRgb**
+
+**luvToXyz**, **xyzToLuv**
+
+**lchToLuv**, **luvToLch**
+
+Also available for [Stylus](http://stylus-lang.com/). See
+[here](https://github.com/hsluv/hsluv-stylus).
+
+## Changelog
+
+### 0.1.0
+
+- Provide Typescript definitions in the NPM package.
+
+### 0.0.3
+
+- Expose intermediate functions in the public API.
+
+### 0.0.2
+
+- Improve packaging and minification.
+
+### 0.0.1
+
+- Initial release under the name HSLuv. Old releases can be found [here](https://www.npmjs.com/package/husl).