* added deckgl geojson layer
* linting
* fixed comments
* addressed comments
* added override with controls.color_picker > 0
* set var properly
* set colors if property doesnt exist at all
* refacator on property mapping
* DECKGL integration
Adding a new set of geospatial visualizations building on top of the
awesome deck.gl library. https://github.com/uber/deck.gl
While the end goal it to expose all types of layers and let users bind
their data to control most props exposed by the deck.gl API, this
PR focusses on a first set of visualizations and props:
* ScatterLayer
* HexagonLayer
* GridLayer
* ScreenGridLayer
* Addressing comments
* lint
* Linting
* Addressing chri's comments