Setup the Rails testing framework with rspec, capybara, spring, and guard. Spring was chosen over spork because it is available by default in new Rails 4.1+ applications, and the rails-spork gem requires spork, which has a bug. The bug in spork is fixed in the rspec3_runner branch, but that isn't the version available at rubygems. Furthermore, spring is extremely fast.
Added specs for helpers and models.