convert query parameters to objects

[Orlandster]

Let's take getLocationsByRadius() as an example. Currently the parameters get passed like this (center, radius, startAt = 1, endAt = undefined). This is pretty hard to understand for the user...

There should just be one object passed as parameter e.g.
getLocationsByRadius({ center: { lat: 1, lng: 1 }, radius: 5, startAt: 1, endAt: 2 })

All the validations and the tests need to be modified. (Just the way they get passed to the validators is important!)