Fix for gevent crash on Windows.

[ghost]

import socket is needed for windows.

[warrenarea]

i was looking over gevent code and they import the socket
to trigger the WSAstartup call, (to prevent it from crashing), and
then delete it right after. would probably be a good idea in
practice not to have the sockets import lingering around.

import sys
if sys.platform == 'win32':
import socket # trigger WSAStartup call
del socket
del sys

[warrenarea]

https://github.com/gevent/gevent/blob/master/gevent/__init__.py