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Enable 3.7 on appveyor.

See https://github.com/python/cpython/commit/b2a6083eb0384f38839d3f1ed32262a3852026fa

Also add some things missing from __all__ on Windows 3.7.

Because it fails to cleanup a thread for some reason.

Update to libuv 1.22

Don't pass the port when calling getaddrinfo from socket.connect.

Also only attempt to resolve the address when we are AF_INET or AF_INET6; previously all other tuple address families would have been passed to getaddrinfo where they probably failed.

Monkey-patch queue.SimpleQueue to be queue._PySimpleQueue.

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Use bytearray += instead of bytearray.extend

travis seems to be stuck building a missing commit, hopefully this frees it.

This compiles to fewer bytecodes and uses built-in slots instead of
method dispatch, so it should be faster.

Benchmarks show a tiny improvement (using the same benchmarks as
issue #1233, so not exactly designed to test this):

RPS

+------+------+-------+
|Size  |master|+=     |
+------+------+-------+
|1     |5.60  | 5.63  |
+------+------+-------+
| 10   |5.49  |  5.53 |
+------+------+-------+
|  100 |4.99  |   5.00|
+------+------+-------+
|  1000|3.53  |   3.57|
+------+------+-------+

Use a buffer to generate HTTP chunks.

The intent is to reduce network overhead for small chunk sizes withoud adding much overhead for larger sizes.

Fixes #1233.

Only issue the ssl MonkeyPatchWarning if we can be pretty sure there will be problems

This increases the false negative chances, but decreases the false positives substantially.

Fix a typo in pywsgi.py
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