We've made some major improvements to the Buttons library. In order to integrate buttons into your current project you'll need to make the following changes:
Compass has been replaced with [autoprefixer](https://github.com/postcss/autoprefixer). Compass is not recommended but it is still supported.
Button colors are now complete independent (ex. button-primary) we no longer have classes like button-flat-primary to achieve this you now simply add button-flat button-primary
Buttons styles are now independent (ex. button-flat, button-3d, etc.). You can apply these styles and they will automatically pick up the color attached to the button (ex. button-primary button-3d)