Author: Simey Lameze
MDL-59142 core_theme: cache post-processed css
Thanks Cameron Ball for the base patch
http://git.moodle.org/gw?p=moodle.git;a=commit;h=481a5ce58b066afd5cb96d582ffda34577ffe775
http://github.com/moodle/moodle/commit/481a5ce58b066afd5cb96d582ffda34577ffe775
+ 3.3 en [cachedef_postprocessedcss,core_cache]