Upgrade to Rails 2.2.0

As a side benefit, fix an (non-user-visible) bug in display_s5().
Also fixed a bug where removing orphaned pages did not expire cached summary pages.

vendor/rails/actionpack/lib/action_view/helpers.rb

@@ -0,0 +1,38 @@
+Dir.entries(File.expand_path("#{File.dirname(__FILE__)}/helpers")).sort.each do |file|
+  next unless file =~ /^([a-z][a-z_]*_helper).rb$/
+  require "action_view/helpers/#{$1}"
+end
+
+module ActionView #:nodoc:
+  module Helpers #:nodoc:
+    def self.included(base)
+      base.extend(ClassMethods)
+    end
+
+    module ClassMethods
+      include SanitizeHelper::ClassMethods
+    end
+
+    include ActiveRecordHelper
+    include AssetTagHelper
+    include AtomFeedHelper
+    include BenchmarkHelper
+    include CacheHelper
+    include CaptureHelper
+    include DateHelper
+    include DebugHelper
+    include FormHelper
+    include FormOptionsHelper
+    include FormTagHelper
+    include NumberHelper
+    include PrototypeHelper
+    include RecordIdentificationHelper
+    include RecordTagHelper
+    include SanitizeHelper
+    include ScriptaculousHelper
+    include TagHelper
+    include TextHelper
+    include TranslationHelper
+    include UrlHelper
+  end
+end