Add wrapping of where clause to adapter findQuery

Wrap the passed in query in a `{ where: }` if not already wrapped.  For brevity.

Been using this in my own project and seems to work pretty well, thought you guys may be interested in it.
Before being passed to super, the `whereQuery.where` must also be `JSON.stringify`ed. Weird, but that is what they do. I like the pass-where-or-dont part of this though, well done.