Merge pull request sorrycc#732 from infusion/master

Added Quaternion.js

Author: gokaygurcan

README.md

@@ -457,6 +457,7 @@ There're also some great commercial libraries, like [amchart](https://www.amchar
 * [Fraction.js](https://github.com/infusion/Fraction.js) - A rational number library for JavaScript.
 * [Complex.js](https://github.com/infusion/Complex.js) - A complex number library for JavaScript.
 * [Polynomial.js](https://github.com/infusion/Polynomial.js) - A polynomials library for JavaScript.
+* [Quaternion.js](https://github.com/infusion/Quaternion.js) - A quaternion library for JavaScript
 
 
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