Media queries splitted in different files

[stol]

Hi, you can now choose to output the grouped media queries in different files, on file per media query.

ex :

$ group-css-media-queries -s myApp.css 
$ # outputs :
$ # Creating app-splitted/app-root.css
$ # Creating app-splitted/app-only-screen-and-(max-width-480px).css
$ # Creating app-splitted/app-only-screen-and-(min-width-481px)-and-(max-width-768px).css


$ group-css-media-queries -s myApp.css -d customDir
$ # outputs :
$ # Creating customDir/app-root.css
$ # Creating customDir/app-only-screen-and-(max-width-480px).css
$ # Creating customDir/app-only-screen-and-(min-width-481px)-and-(max-width-768px).css

[ivankravchenko]

whole block in ELSE statement can be replaced with
[rootRules].concat mediaRules