* Renames `noAggressiveMerging` option into `aggressiveMerging`.
* Renames `noRebase` option into `rebase`.
* Speeds up advanced processing by shortening optimize loop.
+* Fixed issue [#125](https://github.com/GoalSmashers/clean-css/issues/125) - source maps!
* Fixed issue [#344](https://github.com/GoalSmashers/clean-css/issues/344) - merging background-size into shorthand.
* Fixed issue [#360](https://github.com/GoalSmashers/clean-css/issues/360) - adds 7 extra CSS colors.
* Fixed issue [#363](https://github.com/GoalSmashers/clean-css/issues/363) - `rem` units overriding `px`.