'Create an image for node.
Please refer to GoGrid documentation to get info
how prepare a node for image creation:
http://wiki.gogrid.com/wiki/index.php/MyGSI
:keyword    node: node to use as a base for image
:type       node: :class:`GoGridNode`
:keyword    name: name for new image
:type       name: ``str``
:rtype: :class:`NodeImage`'

def ex_save_image(self, node, name):

    params = {'server': node.id, 'friendlyName': name}
    object = self.connection.request('/api/grid/image/save', params=params, method='POST').object
    return self._to_images(object)[0]
