Toots
2.0.0 makes bourbon available via npm instead of bower, and updates to bourbon 4.3.3.
If you are upgrading from 1.x, you should remove bourbon from your app's bower.json file.
In addition, you will find that bourbon now deprecates it's mixins that exist only for browser compatibility prefixing. You may want to ember install ember-cli-autoprefixer if you aren't already using it, and transition away from those mixins.