Add release notes for 2.1.1

Author: bdarnell

website/sphinx/releases.rst

@@ -4,6 +4,7 @@ Release notes
 .. toctree::
    :maxdepth: 2
 
+   releases/v2.1.1
    releases/v2.1.0
    releases/v2.0.0
    releases/v1.2.1

website/sphinx/releases/v2.1.1.rst

@@ -0,0 +1,29 @@
+What's new in Tornado 2.1.1
+===========================
+
+Oct 4, 2011
+-----------
+
+Bug fixes
+~~~~~~~~~
+
+* Fixed handling of closed connections with the ``epoll`` (i.e. Linux)
+  ``IOLoop``.  Previously, closed connections could be shut down too early,
+  which most often manifested as "Stream is closed" exceptions in
+  ``SimpleAsyncHTTPClient``.
+* Fixed a case in which chunked responses could be closed prematurely,
+  leading to truncated output.
+* ``IOStream.connect`` now reports errors more consistently via logging
+  and the close callback (this affects e.g. connections to localhost
+  on FreeBSD).
+* ``IOStream.read_bytes`` again accepts both ``int`` and ``long`` arguments.
+* ``PeriodicCallback`` no longer runs repeatedly when ``IOLoop`` iterations
+  complete faster than the resolution of ``time.time()`` (mainly a problem
+  on Windows).
+
+Backwards-compatibility note
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+* Listening for ``IOLoop.ERROR`` alone is no longer sufficient for detecting
+  closed connections on an otherwise unused socket.  ``IOLoop.ERROR`` must
+  always be used in combination with ``READ`` or ``WRITE``.