code: function (key) {
                          key = _value(key);
  
                          if (angular.isArray(key)) {
                              key.map(this._removeItem, this);
                          } else {
                              this._removeItem(key);
                          }
  
                          return this;
                      }
docs: Remove specified item(s) from storage
  
  @public
  
  @param  {String|Array}  key  The key or array of keys to remove
  
  @return {Object}