LearnBoost/stylus — pull request #1664 by janv (2014-08-18 10:27:31+00:00)
Title: Fix for #955: Stop weird behavior when adding percentages

What do you expect the result of `10% + 10%` to be? Well, everyone in
the world would say `20%`. Stylus thinks it should be `11%`.

Fixes learnboost/stylus#955