npm install
grunt
- https://en.wikipedia.org/wiki/Set_%28game%29
- http://smart-games.org/en/set_classic/start/10
- https://www.npmjs.com/package/set-game-js
- https://github.com/zeljkofilipin/set-game-js
- http://filipin.eu/playing-set-game-with-ruby-and-selenium
- https://youtu.be/sTDY7Sb18x4
- yaml validator
- markdown validator
