autoprefixer support
pass browsers as array to autoprefixer filter
redirect autoprefixer output to file due to proc_open bug on windows
removed duplicate output option
Created a test to verify commented imports are not imported
Merge pull request #634 from wgriffioen/master

Created a test to verify commented imports are not imported
Merge pull request #472 from mente/autoprefixer

autoprefixer support
Merge pull request #2 from kriswallsmith/master

Update from origin