Remove Fuubar

Previously, we used to include Fuubar to make our RSpec output prettier, but it has since been removed from the RSpec configuration, which makes the inclusion of the Fuubar gem obsolete. Removed the gem from the Gemfile and updated the bundle.

https://trello.com/c/9ldd9z5R

![](http://www.reactiongifs.com/r/chfo.gif)