Create a new node

def update(self, name, **kwargs):
        """
        Create a new node
        """
        # These arguments are allowed
        self.allowed('update', kwargs, ['hostname', 'port', 'status',
                     'storage_hostname', 'volume_type_name', 'size'])
        # Remove parameters that are None
        kwargs = self.unused(kwargs)
        return self.http_post('/nodes/%s' % name, params=kwargs)