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Allow weakreferences to Queue objects. Fixes #1217.

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Fix gevent.os.nb_write/read not always closing the IO event the opened, which is a problem on libuv.

Also fix the formatting in changelog_1_0.rst so it renders legibly.

I checked with restview --long --pypi and the long description still
renders nicely, as do the pages created by sphinx

I thought the use of .. include:: would make README.rst still render
with all its contents, but sadly github doesn't enable
that (https://github.com/github/markup/issues/172)

 Let Event have weak references.

Catch the ValueError that sys._getframe() can raise when there are no Python frames.

This can happen in the embedded case, when the CPython C api is used to directly call Greenlet.spawn, which itself is now implemented in C.

Fixes #1212.

Move the __weakref__ to the base class for Cython because we did see a failure in 3.6 too: https://travis-ci.org/gevent/gevent/jobs/379718754#L753

Fixes #1211

Note that this can crash on CPython 3.7b4; see https://github.com/cython/cython/issues/2270

Refs #1207 and #1209.

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Run leakchecks on Python 3.7.

Fix ABCs in the MRO of gevent.local. Fixes #1201

Try to make it take less than the 200s timeout.

Update config.guess/sub to latest versions.

Fixes #1197

Switch to objgraph to handle the measurement for us. That cleared up a
few of the obscure issues with references to
functions/getset_descriptors and the like. (Possibly because it keys
by string names and we were keeping type objects alive.)

Many of the real failures were due to re-using exception instances,
which is bad because of chaining.

Most of the @ignore_leakcheck are for performance, only one is for a
real issue---and that test was skipped already on CI anyway for being
too flaky.

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Sigh, the timer resolution is really flaky on CI. Patch test__core_timer.py:test_resolution to use the mechanism to handle this.

As suggested by https://packaging.python.org/guides/making-a-pypi-friendly-readme/ and https://github.com/pypa/warehouse/issues/3884#issuecomment-386188844, this may now be necessary on warehouse.

Adding it to setup.py results in 'distutils/dist.py:274: UserWarning: Unknown distribution option: 'long_description_content_type'' even with setuptools 39, but setup.cfg is equivalent. I verified that PKG-INFO has the appropriate 'Description-Content-Type: text/x-rst' field.

Queue all libuv callbacks and run them at the end of the iteration

Invalid FDs were getting through because of the order in which we ran loop callbacks.