fixes #38 return key/prop combined object.

This currently only patches `.get` & `.getAll` to return a single array of combined key/property objects. I will move on to `query` if this seems headed in the right direction :+1: 
My mind was drawing a blank on what to name this. `formatArray` by itself is pretty non-descript, but when used outside of the file, `entity.formatArray`, it sounds a little better. I went back and forth on this for a while, but thought I'd just bring it to your attention if you have any better ideas.