code: function create (todoList, text) {
    // Hand waving here -- not showing how this interacts with XHR or persistent
    // server-side storage.
    // Using the current timestamp in place of a real id.
    var id = Date.now();
    _todos[id] = {
      id: id,
      todo_list_id: todoList.id,
      complete: false,
      text: text
    };
  }
docs: Create a TODO item.
  @param  {string} text The content of the TODO