Should be possible to interact with the query object during findById operations

[fatmatto]

The findById method of the controller ignores the query objects making it impossible to interact with from outside. A common scenario where you might want to interact with the query is, for example, the following.

• I want to fetch a resource by its id by calling: GET /pets/1234 where 1234 is its id.
• I want to make sure that only the owner of the resource can access it, so I want to modify the default query { "id": "1234" } and turn it into { "owner":req.currentUser,"id":"1234" }

At the moment this is not possible, so we might need to modify the findById method of the controller in order to support it.