Moving from having the user define an interceptor function that operates
on one object at a time.
By passing the entire array, it's possible to do multiple pass where
needed. A common pattern might be to figure out the max value in order
to define a scaler function. That's only possible if dealing with the
whole array.
* Using JS to customize spatial viz and tooltips
* Add missing deck_multi.png
* Improve GeoJSON layer with JS support and extra controls
* Addressing comments
