Send the patch into AC::B.

Because of the way the tests worked, I assumed I had to put
the patch into ApplicationController. It'll actually work in
ActionController::Base, due to the way that the real code
is structured.

Yay stubs.

lib/draper/action_controller/base.rb

@@ -6,4 +6,4 @@ def view_context
   end
 end
 
-ApplicationController.send(:include, DraperViewContext)
+ActionController::Base.send(:include, DraperViewContext)

spec/support/samples/application_controller.rb

@@ -1,24 +1,24 @@
 require './spec/support/samples/application_helper'
 
 module ActionController
-  class Base
-    @@before_filters = []
-    def self.before_filters
-      @@before_filters
-    end
-    def self.before_filter(name)
-      @@before_filters << name
-    end
-
+  class AbstractController
     def view_context
-#      puts "zomg view context"
       @view_context ||= ApplicationController
     end
 
     def view_context=(input)
       @view_context = input
     end
   end
+  class Base < AbstractController
+    @@before_filters = []
+    def self.before_filters
+      @@before_filters
+    end
+    def self.before_filter(name)
+      @@before_filters << name
+    end
+  end
 end
 
 class ApplicationController < ActionController::Base