Allow parsing of single resource objects.
Allow parsing of single resource objects.

http://jsonapi.org/format/#document-top-level
```
Primary data MUST be either:

a single resource object, a single resource identifier object, or null, for requests that target single resources
an array of resource objects, an array of resource identifier objects, or an empty array ([]), for requests that target resource collections
```

The data object may not be an array of resource objects, but a single resource object.

You may need to test the change ;)
alexaivars/jsonapi-util