Merge branch 'master' of github.com:rails/rails

* 'master' of github.com:rails/rails:
  Cache flash now
  Revert "Use freeze instead of close!"
  Revert "Eagerly load Signed and Permanent cookies"
  cookies here
  Eagerly load Signed and Permanent cookies
  Use freeze instead of close!

actionpack/lib/action_dispatch/middleware/flash.rb

@@ -149,7 +149,7 @@ def replace(h) #:nodoc:
       #
       # Entries set via <tt>now</tt> are accessed the same way as standard entries: <tt>flash['my-key']</tt>.
       def now
-        FlashNow.new(self)
+        @now ||= FlashNow.new(self)
       end
 
       # Keeps either the entire current flash or a specific flash entry available for the next action:

actionpack/test/dispatch/cookies_test.rb

@@ -521,7 +521,7 @@ def test_setting_cookies_raises_after_stream_back_to_client
     end
   end
 
-  def test_setting_cookies_raises_after_stream_back_to_client_even_with_an_empty_flash
+  def test_setting_cookies_raises_after_stream_back_to_client_even_without_cookies
     with_test_route_set do
       get '/dont_set_cookies'
       assert_raise(ActionDispatch::ClosedError) {
@@ -540,7 +540,7 @@ def test_setting_permanent_cookies_raises_after_stream_back_to_client
     end
   end
 
-  def test_setting_permanent_cookies_raises_after_stream_back_to_client_even_with_an_empty_flash
+  def test_setting_permanent_cookies_raises_after_stream_back_to_client_even_without_cookies
     with_test_route_set do
       get '/dont_set_cookies'
       assert_raise(ActionDispatch::ClosedError) {
@@ -559,7 +559,7 @@ def test_setting_signed_cookies_raises_after_stream_back_to_client
     end
   end
 
-  def test_setting_signed_cookies_raises_after_stream_back_to_client_even_with_an_empty_flash
+  def test_setting_signed_cookies_raises_after_stream_back_to_client_even_without_cookies
     with_test_route_set do
       get '/dont_set_cookies'
       assert_raise(ActionDispatch::ClosedError) {