*Removesupportforolddouble-encodedcookiesfromthecookiestore.Thesevalueshaven't been generated since before 2.1.0, and any users who have visited the app in the intervening 6 months will have had their cookie upgraded. [Koz]
* Allow helpers directory to be overridden via ActionController::Base.helpers_dir #1424 [Sam Pohlenz]