Create the recommended spec/support/devise.rb file to use Devise test helpers in RSpec functional tests.
Install Capybara for integration testing.

 * Rename spec/integration to spec/features to conform to what
   Capybara expects.
 * Require capybara/rspec in the spec_helper.
Add a simple RSpec integration test (using capybara) which tests that signing in and out works properly from the user interface.