CSS lint addon with https://github.com/stubbornella/csslint

Here a patch which provides a CSS Lint addon which uses https://github.com/stubbornella/csslint

This addon highlighted only one character when there is an error/warn message because the CSSLint provides just line/col info. 

I have created an issue for this problem https://github.com/stubbornella/csslint/issues/411 
If CSSLint fixes the problem I will do a patch for this CSS lint addon to highlight the whole word (and not only one character).