Runs the CWD's scent file.

def run(self):
        """
        Runs the CWD's scent file.
        """
        if not self.scent or len(self.scent.runners) == 0:
            print("Did not find 'scent.py', running nose:")
            return super(ScentSniffer, self).run()
        else:
            print("Using scent:")
            arguments = [sys.argv[0]] + list(self.test_args)
            return self.scent.run(arguments)
        return True