Support spec/features for integration tests

With the advent of Capybara 2, the community [decided that RSpec needed
yet another name for integration tests][1]. My `:Rintegrationtest` muscle memory was killing me.

[1]: http://alindeman.github.com/2012/11/11/rspec-rails-and-capybara-2.0-what-you-need-to-know.html