tubalmartin/YUI-CSS-compressor-PHP-port — pull request #8 by jchatard (2013-08-06 01:50:32+00:00)
Title: Closed #7 preserve % on keyframe 0%

I've directly back ported the approach used in YUI, that is stripping units first as it was, and then re-adding the `%` between the `0` and `{`.