Don't use arrays at the top level for collections

[tomyan]

It leaves us with nowhere to put collection-wide metadata.

[apfrancis]

Looks like the committed code has an example that returns an array for a collection and an object for a singular item (this LGTM) - but the commit message talks about not using arrays at the top level for collections.

@tomyan is the suggestion here to have a wrapper object for associated metadata and an inner object for results? e.g.

{
   "foo": "bar",
   "results": []
}