Add 'user-select' to vendor mixins
Add 'user-select' to vendor mixins

http://caniuse.com/#feat=user-select-none
girassolbit/kouto-swiss,leny/kouto-swiss,krkn/kouto-swiss,leny/kouto-swiss,greyhwndz/kouto-swiss,greyhwndz/kouto-swiss,krkn/kouto-swiss,girassolbit/kouto-swiss