Code to Serialization Data as JsonApi does not handle relationships correctly

[BlairAllegroTech]

As relationship fields in js-data are not enumerable we must instead enumerate the relationships and try to retrieve them from the object.

[BlairAllegroTech]

If relationships exist we can optionally include them in the response if the new options:

• updateRelationships is set. This options defaults to false

return ds.save('author', author.id, { jsonApi: { updateRelationships: true } });