Fix load-order inconsistency (closes #9081) [themug]

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@7225 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

activesupport/lib/active_support/core_ext.rb

-Dir[File.dirname(__FILE__) + "/core_ext/*.rb"].each { |file| require(file) }
+Dir[File.dirname(__FILE__) + "/core_ext/*.rb"].sort.each { |file| require(file) }