Merge pull request #516 from gucki/master

add missing require for ordered_hash dependency

activesupport/lib/active_support/json/encoding.rb

@@ -2,6 +2,7 @@
 require 'active_support/core_ext/module/delegation'
 require 'active_support/deprecation'
 require 'active_support/json/variable'
+require 'active_support/ordered_hash'
 
 require 'bigdecimal'
 require 'active_support/core_ext/big_decimal/conversions' # for #to_s