code: function (title, callback) {
          title = title || '';
          callback = callback || function () { };
  
          var newItem = {
            title: title.trim(),
            completed: false
          };
  
          storage.save(newItem, callback);
        }
docs: Creates a new todo model
  
  @param {string} [title] The title of the task
  @param {function} [callback] The callback to fire after the model is created