Merge pull request #405 from grant-olson/fix_for_401_traceback_in_log_output

Fix for traceback on OSX.  Fixes Bitmessage/PyBitmessage#401

src/shared.py

@@ -355,7 +355,7 @@ def checkSensitiveFilePermissions(filename):
                 return True
         except:
             # Swallow exception here, but we might run into trouble later!
-            logger.error('Could not determine filesystem type.', filename)
+            logger.error('Could not determine filesystem type. %s', filename)
         present_permissions = os.stat(filename)[0]
         disallowed_permissions = stat.S_IRWXG | stat.S_IRWXO
         return present_permissions & disallowed_permissions == 0