Angular2 DI does not work for ToDo example.

Seems like something is wrong with components bootstrapping as ng2_todo example fails to load with this exception:

Unhandled Promise rejection: Can't resolve all parameters for Ng2Todo: (?). ; Zone: ; Task: Promise.then ...

The reason is NG2 DI system cannot inject service TodoStore mentioned in Ng2Todo components' constructor:

    constructor(todoStore: TodoStore) {
        this.todoStore = todoStore;
    }

If I it's told manually what should be injected, example works fine:

    constructor(@Inject(TodoStore) todoStore: TodoStore) {
        this.todoStore = todoStore;
    }