Updated template and views to use API.

Updated template and views to use API.

Set up Rest Framework backend in settings.py and removed geojson from installed apps, requirements.txt and the template tag in symbology_map.  Created custom filters in  json _views for markers and people. The filters allow multiple model fields to be queried in the url at one time.  Without the filter, only one markerid could be queried and markerid could not be combined with any other model field.  Altered SymbologyMapView and template to use the API.