Feature/tilemap

I think TileMap is ready for review. 
There some UI features that I'd like to discuss to enable switching map types and setting/changing some params.

For now, default map type is the quantizeCircleMarkers.
To change map type, see 73 to 76: 
https://github.com/jthomassie/kibana/blob/feature/tilemap/src/kibana/components/vislib/visualizations/tile_map.js#L73-76
While commenting out the sections of the `eventResponse` method worked in getting maps rendering, it shouldn't be merged in its current state as it will cause problems for all the other visualization types that use this method. Another solution is needed to get maps working before it can be merged into master.