* Test PyPy 3.5-5.7.1-beta

Add a missing `clear` method to the tblib Frame object.

[skip appveyor]

* Add PyPy3.5 tests

* Standard PyPy fixes for imported tests.

* more gevent/pypy3.5 blackouts and missing cert files

* another blackballed test due to performance issues.

* missing revocation.crl for test_ssl.py

* Fix test_urllib2_localnet. We had to resort to a patch.

* Adjust timeouts for PyPy3.

* Add test_wsgiref for 3.5 and 3.6 and comment about it being broken

It's broken for all of them, not just PyPy, so move its patch to
reflect that.

Move 3rd party libraries to deps/ directory.

Move gevent and greentest to src/ directory. This fixes tox.

At this point the builds should all work the same. Lets check.

Also update the test_ssl.py to cpython rev 2c9ff9e (head). This fixes the
problems with invalid certs for svn.python.org.

These tests include much more testing of the new-in-2.7.9 SSLContext
settings, which revealed some problems in our hostname validation, our
handling of read/write/do_handshake for closed sockets, and the missing
alpn_selected method.