Raster in Legend for MapView

[alansnow21]

Currently the documentation there is an option for the raster type in the map view legend:

http://docs.tethysplatform.org/en/latest/tethys_sdk/gizmos/map_view.html#mvlegendclass

And it looks like there is a framework for it in place here:

Line 1111: https://github.com/tethysplatform/tethys/blob/dev/tethys_gizmos/static/tethys_gizmos/js/tethys_map_view.js

What are the plans for implementation? When will it happen?

Any ideas for connecting it with a GeoServer style?