NCI-Agency/anet#547: Refactor class to access Leaflet ES6-style and fix broken references to L
NCI-Agency/anet#547: Refactor class to access Leaflet ES6-style and fix broken references to L

NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet,NCI-Agency/anet