Consider adopting Stylelint

SCSS-lint is old and silly.

Stylelint seems to have taken the _community_ by storm:
https://stylelint.io/

Looks like Hound supports it as well:
http://help.houndci.com/en/articles/2461415-supported-linters
https://github.com/houndci/hound/pull/1334

Should we use it? 