This should let our custom css show on readthedocs.org.

Original commit message:

Revert "Run the website in python2.7 mode"

Can't use python2.7 mode without migrating to the "high-replication
datastore", and even though we don't have any data "migration" is a
pain.

This reverts commit e960e9bc.

Original commit message:

Add a version check for the curses unicode hack so it won't break when
python 3.2.3 or 3.3 are released.

Closes #450.

pass its tests with newer versions.

Accept None as auth_password in simple_httpclient for consistency with
curl_httpclient.

Add some more test cases that use gen.engine and web.asynchronous together.

it responsible for os.path.sep conversion.

Assorted doc updates for StaticFileHandler.

Etag implementation in RequestHandler changes.

Turn on draft76 support.

Conflicts:
	tornado/websocket.py

Add pypy to the mix for when we do run the perf tests.  Depending on
the benchmark pypy is ~twice as fast as cpython 2.7

Closes #390.

Failure to select a subprotocol is not fatal, so rename method from
validate_subprotocol to select_subprotocol.  Subprotocols are a
comma-separated list in the RFC version, but a single value in
draft76.

Conflicts:
	tornado/websocket.py

handshake, to work with SSL proxies that do not insert an X-Scheme header.

Closes #437.

Closes #439.

Conflicts:
	tornado/test/simple_httpclient_test.py