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/railties/lib/tasks/misc.rake

@@ -3,10 +3,9 @@ task :environment do
   require(File.join(RAILS_ROOT, 'config', 'environment'))
 end
 
-require 'rails_generator/secret_key_generator'
-desc 'Generate a crytographically secure secret key. This is typically used to generate a secret for cookie sessions. Pass a unique identifier to the generator using ID="some unique identifier" for greater security.'
+desc 'Generate a crytographically secure secret key. This is typically used to generate a secret for cookie sessions.'
 task :secret do
-  puts Rails::SecretKeyGenerator.new(ENV['ID']).generate_secret
+  puts ActiveSupport::SecureRandom.hex(64)
 end
 
 require 'active_support'
@@ -54,4 +53,4 @@ namespace :time do
       puts "\n"
     end
   end
-end
+end