Rails 2.3.3.1

Update to latest Rails.
A little bit of jiggery-pokery is involved, since they
neglected to re-include vendored Rack in this release.

vendor/rails/activesupport/lib/active_support/json/encoders/true_class.rb

@@ -1,5 +1,7 @@
 class TrueClass
-  def to_json(options = nil) #:nodoc:
-    'true'
+  AS_JSON = ActiveSupport::JSON::Variable.new('true').freeze
+
+  def as_json(options = nil) #:nodoc:
+    AS_JSON
   end
 end