line 67 in connection.py unhandled exception

The try-catch block has a unhandled exception in the catch statement in line 67. This happens when we pass a url that is of type 'https' but it does not have a valid certificate certified by a CA.

This throws the following exception:
`>>> c.list_events(start=start_xchange, end=end_exchange, details=True)
Traceback (most recent call last):
File "", line 1, in
File "/usr/local/lib/python2.7/dist-packages/pyexchange/exchange2010/__init__.py", line 95, in list_events
return Exchange2010CalendarEventList(service=self.service, start=start, end=end, details=details)
File "/usr/local/lib/python2.7/dist-packages/pyexchange/exchange2010/__init__.py", line 113, in __init__
response_xml = self.service.send(body)
File "/usr/local/lib/python2.7/dist-packages/pyexchange/base/soap.py", line 34, in send
response = self._send_soap_request(request_xml, headers=headers, retries=retries, timeout=timeout, encoding=encoding)
File "/usr/local/lib/python2.7/dist-packages/pyexchange/exchange2010/__init__.py", line 44, in _send_soap_request
return super(Exchange2010Service, self)._send_soap_request(body, headers=headers, retries=retries, timeout=timeout, encoding=encoding)
File "/usr/local/lib/python2.7/dist-packages/pyexchange/base/soap.py", line 65, in _send_soap_request
response = self.connection.send(body, headers, retries, timeout)
File "/usr/local/lib/python2.7/dist-packages/pyexchange/connection.py", line 67, in send
log.debug(err.response.content)
AttributeError: 'NoneType' object has no attribute 'content'
`

This is thrown because of `_ssl.c:504: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed` in the requests (line 64) has verify=True set by default. Turning that flag off does everything normally.