Fixed backdoor.py and test__backdoor.py for PY3
Fix travis deadsnakes python missing file for PY3
Fix c-ares support for PY3
Fix missing six.builtins
fix _socket3 send/sendall
Fixed test__core_stat.py
Fixed subprocess tests.
gevent/local.py
 * doctest
Fix str/bytes issue.
 * udp_client.py
 * gevent/subprocess.py
Fix range issue.
 * test__order.py
Fixed test__refcount.py
Fixed test__socket.py
Fixed test__examples
Fixed test__ssl.py
Fixed test__greenio.py
Fix tests for PY3.
Fixed test__pool.py for PY3
Fixed test__os.py for PY3
Fixed test__all.py
Fix resource warning caused by FeedParser in pywsgi.py