Reference ActionController directly when including split helpers (#602)

Author: andrehjr

lib/split/engine.rb

@@ -4,10 +4,10 @@ class Engine < ::Rails::Engine
     initializer "split" do |app|
       if Split.configuration.include_rails_helper
         ActiveSupport.on_load(:action_controller) do
-          include Split::Helper
-          helper Split::Helper
-          include Split::CombinedExperimentsHelper
-          helper Split::CombinedExperimentsHelper
+          ::ActionController::Base.send :include, Split::Helper
+          ::ActionController::Base.helper Split::Helper
+          ::ActionController::Base.send :include, Split::CombinedExperimentsHelper
+          ::ActionController::Base.helper Split::CombinedExperimentsHelper
         end
       end
     end