Caffeine is a set of Sass mixins and functions ready to use for projects. First versions of Caffeine were embedded as _system definitions in Melange. As the mixins and functions grow, they are seperated from Melange in order to use them freely.
Caffeine can directly install your project by copying the contents of lib folder to your assets, and npm or bower packages. Just run,
with npm (npm package renamed to kafein due to name conflicts)
npm install kafein
or with bower
bower install caffeine
After copying the files, at the top of your Sass file add the following line
@import "<path-to-caffeine>/caffeine";