install ActionController::UrlFor before environment is parsed, to provide ActionMailer#default_url_options=

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

actionmailer/lib/action_mailer/railtie.rb

@@ -5,6 +5,10 @@ module ActionMailer
   class Railtie < Rails::Railtie
     railtie_name :action_mailer
 
+    initializer "action_mailer.url_for", :before => :load_environment_config do |app|
+      ActionMailer::Base.send(:include, ActionController::UrlFor) if defined?(ActionController)
+    end
+
     require "action_mailer/railties/subscriber"
     subscriber ActionMailer::Railties::Subscriber.new
 
@@ -17,9 +21,5 @@ module ActionMailer
         ActionMailer::Base.send "#{k}=", v
       end
     end
-
-    initializer "action_mailer.url_for" do |app|
-      ActionMailer::Base.send(:include, ActionController::UrlFor) if defined?(ActionController)
-    end
   end
-end
+end