Pretty print the configuration dict to stdout.

def dump_config(self):
        """Pretty print the configuration dict to stdout."""
        yaml_content = self.get_merged_config()
        print('YAML Configuration\n%s\n' % yaml_content.read())
        try:
            self.load()
            print('Python Configuration\n%s\n' % pretty(self.yamldocs))
        except ConfigError:
            sys.stderr.write(
                'config parse error. try running with --logfile=/dev/tty\n')
            raise