[Feature] Add autoprefixer as postProcessor

[M3lkior]

Hi,

An autoprefixer postProcessor would be a nice and helpfull feature : https://github.com/ai/autoprefixer

It's based on Can i use database and was used by Twitter and co ...

[lumone]

Bootstrap now requires autoprefixer for compiling from LESS.

Autoprefixer required for Less/Sass
Bootstrap uses Autoprefixer to deal with CSS vendor prefixes. If you're compiling Bootstrap from its Less/Sass source and not using our Gruntfile, you'll need to integrate Autoprefixer into your build process yourself. If you're using precompiled Bootstrap or using our Gruntfile, you don't need to worry about this because Autoprefixer is already integrated into our Gruntfile.

WRO support would be much appreciated for those building bootstrap as such.

[alexo]

@lumone thanks for update.
The project is in the progress of moving everything (documentation, issues, code to a new location: https://github.com/wro4j/wro4j)