Reliably skip cucumber features only on Rails 3.0

Author: alindeman

features/support/rails_versions.rb

@@ -1,4 +1,4 @@
 Around "@unsupported-on-rails-3-0" do |scenario, block|
   require 'rails'
-  scenario.skip_invoke! if ::Rails.version.to_s.start_with?("3.0")
+  block.call unless ::Rails.version.to_s.start_with?("3.0")
 end