Totally random and not github code, but Rachel, are the links on the project website not working? I couldn't click the example site, the style guide, etc.
Everything should be working just fine. I updated many of the pages today (using the same code committed to the WIP branch), and cleared the cache on WP Engine.
I do know that placehold.it has been having issues today that has been causing pages like the components page (http://bootstrapwp.rachelbaker.me/components/) to never finish loading.