Support Serializing API Objects
Support Serializing API Objects

Previously when saving an object, if an editable field is an API
object it would error saying it could not jsonify that field.  Detect
API objects and convert them to their own IDs when serializing.  The
only known instance of this is Linode Configs Kernel attribute.

jo-tez/python-linode-api,linode/python-linode-api