Crude fix for issue #855: automatically initiate SSL handshake in SSLIOStream.
Perhaps this should be exposed as an option instead?
Add in Google OAuth2 support.
Fix up documentation for the class and the Sphinx reference.
Route all callback error logging in IOLoop through handle_callback_exception.
Clear the IOStream buffers on close even when there is no close callback.

Closes #828. (again)
RequestHandler sets its close callback on the HTTPConnection, not the IOStream.

Fixes a bug in which close callbacks would never be called for subsequent
requests on a reused connection.
Merge remote-tracking branch 'pitrou/issue855-ssl-auto-handshake'
Less crude fix for #855: only do anything for already-connected sockets.
Allow deleting all cookies on custom domains
Update ca-certificates.crt to the current Mozilla version.

This file was generated by downloading
https://mxr.mozilla.org/mozilla/source/security/nss/lib/ckfw/builtins/certdata.txt?raw=1
in a web browser to avoid the chicken-and-egg problem with mk-ca-bundle's
built-in downloading, and then running "mk-ca-bundle.pl -n".

Note that we were not affected by the recently-fixed curl bug
(https://github.com/bagder/curl/commit/51f0b798fa), but only because
it had been so long since we had updated this file.
Merge pull request #874 from skazhy/clear-all-cookies-custom-domain

Allow deleting all cookies on custom domains
Add comments for domain and path arguments to cookie-clearing methods.
Update next-release notes.
Document Windows support (or lack thereof).

Closes #871.
Emphasize and clarify docs for AsyncHTTPClient.close.
Document the fact that the {% module %} directive requires a RequestHandler.

Closes #880.
Add a distinct exception for writing a WebSocket message on a closed connection.

This replaces an AttributeError on NoneType.

Closes #879.
In add_callback, hold the lock while writing to the waker pipe.

This protects against a shutdown race condition seen occasionally in
the ThreadedResolver unittests.  This slightly increases contention
on the callback lock in multi-threaded scenarios, but the cost is
limited by the fact that we only write to the pipe once per IOLoop
iteration.

Closes #875.
Add timeout for requests in SimpleAsyncHTTPClient's queue.

The connect_timeout and request_timeout in HTTPRequest only matter when
the _HTTPConnection get created. In heavy-loadded situation requests in
SimpleAsyncHTTPClient may have already timeouted before they pop out
from queue and get actual processed. This commit adds an timeout
callback for every request appended to SimpleAsyncHTTPClient's request
queue that cannot be processed immediately.
Add a test case for async_timeout in SimpleAsyncHTTPClient.