[TASK] Use Promises for GeoJSON

Allow ajax requests, single or list of objects

lib/map.js

@@ -82,7 +82,11 @@ define(['map/clientlayer', 'map/labellayer', 'map/button', 'leaflet', 'map/activ
 
       if (config.geo) {
         [].forEach.call(config.geo, function (geo) {
-          L.geoJSON(geo.json, geo.option).addTo(map);
+          geo.json().then(function (result) {
+            if (result) {
+              L.geoJSON(result, geo.option).addTo(map);
+            }
+          });
         });
       }