a flaw in clean-css' stateless mode.
* Jan Michael Alonzo ([@jmalonzo](https://github.com/jmalonzo)) for a patch
removing node.js' old `sys` package.
+* Luke Page ([@lukeapage](https://github.com/lukeapage)) for suggestions and testing the source maps feature.
+ Plus everyone else involved in [#125](https://github.com/jakubpawlowicz/clean-css/issues/125) for pushing it forward.
* Timur Kristóf ([@Venemo](https://github.com/Venemo)) for an outstanding
contribution of advanced property optimizer for 2.2 release.
* Vincent Voyer ([@vvo](https://github.com/vvo)) for a patch with better