Merge branch 'branch2.4'

Conflicts:
	setup.py
	tornado/__init__.py
	tornado/test/auth_test.py
	website/sphinx/releases.rst

diff --cc website/sphinx/releases.rst
index 474292a1cca6074273ee74d483e8ea9bf357406a,182b4aa72b2263a0725d84396544c4a54454e9d4..421cdfcce2aa177a72bc94ec81590f780892b09c
--- 1/website/sphinx/releases.rst
--- 2/website/sphinx/releases.rst
+++ b/website/sphinx/releases.rst
@@@ -4,7 -4,7 +4,8 @@@ Release note
  .. toctree::
     :maxdepth: 2
  
 +   releases/next
+    releases/v2.4.1
     releases/v2.4.0
     releases/v2.3.0
     releases/v2.2.1