Rails 2.3.1

Update to the release version of Rails 2.3.1.

vendor/rails/railties/lib/initializer.rb

@@ -559,6 +559,7 @@ Run `rake gems:install` to install the missing gems.
     end
 
     def initialize_metal
+      Rails::Rack::Metal.requested_metals = configuration.metals
       Rails::Rack::Metal.metal_paths += plugin_loader.engine_metal_paths
 
       configuration.middleware.insert_before(
@@ -715,6 +716,11 @@ Run `rake gems:install` to install the missing gems.
       @plugins = plugins.nil? ? nil : plugins.map { |p| p.to_sym }
     end
 
+    # The list of metals to load. If this is set to <tt>nil</tt>, all metals will
+    # be loaded in alphabetical order. If this is set to <tt>[]</tt>, no metals will
+    # be loaded. Otherwise metals will be loaded in the order specified
+    attr_accessor :metals
+
     # The path to the root of the plugins directory. By default, it is in
     # <tt>vendor/plugins</tt>.
     attr_accessor :plugin_paths