fixed wrong request call

src/groups.js

                 luticateAuthGroups.usersGetAll= function(data, promise)
                 {
                     return luticateRequest.get("/api/luticate/groups/" + data.group_id + "/users",
-                        data, null, promise);
+                        data, promise);
                 };
 
                 luticateAuthGroups.usersAdd = function(data, promise)