* I18n support for Array#to_sentence. Introduces support.array.words_connector, .two_words_connector, and .last_word_connector translation keys. #1397 [Akira Matsuda]
* Added ActiveSupport::OrderedHash#each_key and ActiveSupport::OrderedHash#each_value #1410 [Christoffer Sawicki]
* Added ActiveSupport::MessageVerifier and MessageEncryptor to aid users who need to store signed and/or encrypted messages. [Koz]
