twitter/bootstrap — pull request #3937 by codler (2012-06-26 09:32:15+00:00)
Title: Update linear-gradient standard

http://blogs.msdn.com/b/ie/archive/2012/06/25/unprefixed-css3-gradients-in-ie10.aspx
http://www.w3.org/TR/2012/CR-css3-images-20120417/#gradients