Route instructions to create viewModel  using an factory function.  e.g.       { route: '', moduleId: 'todoList', title: 'ToDo', nav: false, factory: this.createToDoFunction }
Route instructions to use a provided instance as the viewModel.  e.g.       { route: '', moduleId: 'todoList', title: 'ToDo', nav: false, instance:  new ToDo(aModel) }