LearnBoost/stylus — pull request #1340 by leny (2014-01-14 13:56:09+00:00)
Title: Fix: grayscale() no longer work (#1335)

There's a fix for issue #1335

I've made fallbacks for the three actual functions that can cause problems when used with css `filter` property : `grayscale`, `invert` and `saturate`.