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/activemodel/test/test_helper.rb

@@ -0,0 +1,39 @@
+$:.unshift "#{File.dirname(__FILE__)}/../lib"
+$:.unshift File.dirname(__FILE__)
+
+require 'test/unit'
+require 'active_model'
+require 'active_model/state_machine'
+require 'active_support/callbacks' # needed by ActiveModel::TestCase
+require 'active_support/test_case'
+
+def uses_gem(gem_name, test_name, version = '> 0')
+  require 'rubygems'
+  gem gem_name.to_s, version
+  require gem_name.to_s
+  yield
+rescue LoadError
+  $stderr.puts "Skipping #{test_name} tests. `gem install #{gem_name}` and try again."
+end
+
+# Wrap tests that use Mocha and skip if unavailable.
+unless defined? uses_mocha
+  def uses_mocha(test_name, &block)
+    uses_gem('mocha', test_name, '>= 0.5.5', &block)
+  end
+end
+
+begin
+  require 'rubygems'
+  require 'ruby-debug'
+  Debugger.start
+rescue LoadError
+end
+
+ActiveSupport::TestCase.send :include, ActiveSupport::Testing::Default
+
+module ActiveModel
+  class TestCase < ActiveSupport::TestCase
+    include ActiveSupport::Testing::Default
+  end
+end