Create postgres database.

def create_database(self):
        """ Create postgres database. """
        self.print_message("Creating database '%s'" % self.databases['destination']['name'])
        self.export_pgpassword('destination')
        args = [
            "createdb",
            self.databases['destination']['name'],
        ]
        args.extend(self.databases['destination']['args'])
        for arg in self.databases['destination']['args']:
            if arg[:7] == '--user=':
                args.append('--owner=%s' % arg[7:])
        subprocess.check_call(args)