Add brettstimmerman/mensch CSS parser.

Author: NV

README.mdown

@@ -50,11 +50,12 @@ In CSSOM, `background: gray` [gets overwritten](http://nv.github.io/CSSOM/docs/p
 The last same-name property always overwrites all the previous ones.
 
 
-If you do CSS mungling, minification, image inlining, and such, CSSOM.js is not a good solution for you, look for alternatives instead:
+If you do CSS mungling, minification, image inlining, and such, CSSOM.js is no good for you, considere using one of the following:
 
   * one of the forks: [1](https://github.com/NV/CSSOM/pull/53), [2](https://github.com/NV/CSSOM/pull/57)
   * [reworkcss/css](https://github.com/reworkcss/css)
   * [csso](https://github.com/css/csso)
+  * [mensch](https://github.com/brettstimmerman/mensch)
 
 
 ## [Specs](http://nv.github.com/CSSOM/spec/)