utils.py:  Fixed a bug where older versions of cached files were not being cleaned up properly.
utils.py:  Fixed a bug where get_settings() would run into troubles with strings containing two forward slashes (//).
auth.py:  Fixed a bug where in certain (really obscure) situations applicable_policies() could return incorrect results due to same-name attributes far down the tree.
gateone.py:  Added some error checking when reading in settings on startup.