fixed promises name

src/lutable.js

                     $scope.selectedItems = [];
 
                     var promiseLoadItems = {
-                        id: "promiseLoadItems",
+                        id: "promiseLoadItems_" + $scope.$id,
                         groups: ['itemList']
                     };
                     var promiseDelItems = {
-                        id: "promiseDelItems",
+                        id: "promiseDelItems_" + $scope.$id,
                         loadGroups: ['itemList']
                     };