Fix an issue with rails 2.x due to the image_url changing modules.

lib/compass/app_integration/rails/actionpack2x/urls.rb

@@ -1,4 +1,4 @@
-module Compass::SassExtensions::Functions::Urls
+module Compass::SassExtensions::Functions::Urls::ImageUrl
   def image_url_with_rails_integration(path, only_path = Sass::Script::Bool.new(false), cache_buster = Sass::Script::Bool.new(true))
     if (@controller = Sass::Plugin.rails_controller) && @controller.respond_to?(:request) && @controller.request
       begin

lib/compass/app_integration/rails/runtime.rb

@@ -11,7 +11,7 @@ unless defined?(Compass::RAILS_LOADED)
     else
       require 'compass/app_integration/rails/actionpack2x'
     end
-  rescue LoadError, NameError
-    $stderr.puts "Compass could not access the rails environment."
+  rescue LoadError, NameError => e
+    $stderr.puts "Compass could not access the rails environment: #{e}"
   end
 end