Added Statistics

See: https://github.com/freifunkhamburg/ffffng/issues/24

server/resources/statisticsResource.js

@@ -0,0 +1,26 @@
+'use strict';
+
+angular.module('ffffng').factory('StatisticsResource', function (
+    Logger,
+    NodeService,
+    Resources,
+    ErrorTypes
+) {
+    return {
+        get: function (req, res) {
+            NodeService.getNodeStatistics(function (err, nodeStatistics) {
+                if (err) {
+                    Logger.tag('statistics').error('Error getting statistics:', err);
+                    return Resources.error(res, {data: 'Internal error.', type: ErrorTypes.internalError});
+                }
+
+                return Resources.success(
+                    res,
+                    {
+                        nodes: nodeStatistics
+                    }
+                );
+            });
+        }
+    };
+});