[settings] Better impl. of Setting class, tests for it and refactor hardcoded settings to use it.

bonobo/commands/__init__.py

@@ -27,9 +27,9 @@ def entrypoint(args=None):
 
     args = parser.parse_args(args).__dict__
     if args.pop('debug', False):
-        settings.DEBUG = True
-        settings.LOGGING_LEVEL = logging.DEBUG
-        logging.set_level(settings.LOGGING_LEVEL)
+        settings.DEBUG.set(True)
+        settings.LOGGING_LEVEL.set(logging.DEBUG)
+        logging.set_level(settings.LOGGING_LEVEL.get())
 
     logger.debug('Command: ' + args['command'] + ' Arguments: ' + repr(args))
     commands[args.pop('command')](**args)

bonobo/commands/run.py

@@ -31,10 +31,10 @@ def execute(filename, module, install=False, quiet=False, verbose=False):
     from bonobo import Graph, run, settings
 
     if quiet:
-        settings.QUIET = True
+        settings.QUIET.set(True)
 
     if verbose:
-        settings.DEBUG = True
+        settings.DEBUG.set(True)
 
     if filename:
         if os.path.isdir(filename):