Removed location models

src/libs/models/locations.js

-/* These classes are defined to allow checking of location type with the
-instanceof operator. */
-
-class Location {}
-
-// Location types
-class City extends Location {
-    constructor(id) {
-        super();
-        this.id = id;
-    }
-}
-
-class State extends Location {
-    constructor(id) {
-        super();
-        this.id = id;
-    }
-}
-
-class Region extends Location {
-    constructor(id) {
-        super();
-        this.id = id;
-    }
-}
-
-const locations = {
-    location: Location,
-    city: City,
-    state: State,
-    region: Region };
-
-module.exports = locations;

src/libs/models/simulation.js

@@ -4,8 +4,6 @@ const libs = `${process.cwd()}/libs`;
 const config = require(`${libs}/config`);
 const log = require(`${libs}/log`)(module);
 
-const locations = require(`${libs}/models/locations`);
-
 const Schema = mongoose.Schema;
 
 // Should define this somewhere else