gateone.py:  Fixed a bug in API authentication where the api_auth_window setting wasn't getting converted to a timedelta before comparison.
gateone.py:  Fixed a bug where GOApplications were not getting the 'self.current_user' attribute set properly.
utils.py:  Fixed a bug with create_signature() in Python 2.  This should *actually* correct issue #203 (https://github.com/liftoff/GateOne/issues/203) this time :)
utils.py:  Removed some old leftover debug print() statements.