Add user pagination to rest api

src/routes/users.js

@@ -85,7 +85,13 @@ function update(req, res, next) {
 }
 
 function list(req, res, next) {
-    users.list(function (error, results) {
+    var page = typeof req.query.page !== 'undefined' ? parseInt(req.query.page) : 1;
+    if (!page || page < 0) return next(new HttpError(400, 'page query param has to be a postive number'));
+
+    var perPage = typeof req.query.per_page !== 'undefined'? parseInt(req.query.per_page) : 25;
+    if (!perPage || perPage < 0) return next(new HttpError(400, 'per_page query param has to be a postive number'));
+
+    users.getAllPaged(page, perPage, function (error, results) {
         if (error) return next(new HttpError(500, error));
 
         results = results.map(users.removeRestrictedFields);