Pypy2 5.7.1

This started failing on the newer Ubuntu.

[skip appveyor]

PyPy3-3.5-5.7.1-beta has issues in the traceback
library (https://travis-ci.org/gevent/gevent/jobs/219394025):

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/home/travis/build/gevent/gevent/src/greentest/greentest.py", line 297, in wrap_restore_handle_error
      return method(self, *args, **kwargs)
    File "/home/travis/build/gevent/gevent/src/greentest/greentest.py", line 169, in wrap_timeout
      return method(self, *args, **kwargs)
    File "test__event.py", line 146, in test_set_exception
      self.assertRaises(greentest.ExpectedException, s1.get)
    File "/home/travis/.runtimes/versions/pypy3.5_571/lib-python/3/unittest/case.py", line 728, in assertRaises
      return context.handle('assertRaises', args, kwargs)
    File "/home/travis/.runtimes/versions/pypy3.5_571/lib-python/3/unittest/case.py", line 177, in handle
      callable_obj(*args, **kwargs)
    File "/home/travis/.runtimes/versions/pypy3.5_571/lib-python/3/unittest/case.py", line 201, in __exit__
      traceback.clear_frames(tb)
    File "/home/travis/.runtimes/versions/pypy3.5_571/lib-python/3/traceback.py", line 216, in clear_frames
      tb.tb_frame.clear()
  AttributeError: 'Frame' object has no attribute 'clear'

Fixes #958

[skip appveyor]

Use trusty dist; we seem to be trying to compile pypy for some reason otherwise. Maybe this will fix it. [skip appveyor]

Fix the name of the ``type`` param to gevent.socket.getaddrinfo on Python 3

Previously it would produce a TypeError if a caller tried to pass it
as a keyword argument.

Add a test for this. Also add tests for smtpd under Python 3, which is
where the issue was discovered.

Fixes #960.

Doesn't actually change the license at all, just slightly reformats it. This should be more compatible with github's new license display features.

[skip ci]

Replace optparse with argparse

Fixes #947

Python 2 sockets don't pass type/protocol to getaddrinfo in connect.

Add --quiet option to testrunner.py and use it on CI

Fixes #926

Fixes #943.

Typo correction [skip ci]

[skip ci]

Build OS X wheels with -D_DARWIN_FEATURE_CLOCK_GETTIME=0 for compatib…

[skip ci]

Expose socket.socketpair to Python 3.5 and below on windows. It was added in 3.5, and is an extension for earlier versions.

Add 3.6.0 to appveyor

Update test_httpservers to 2.7.13 (and be explicit about that version…

Update test_httpservers to 2.7.13 (and be explicit about that version on travis). Fixes #924. Works in 2.7.12, haven't yet tried 2.7.8.

Update travis to 3.6.0 final. [skip appveyor]