support Horizontal

support Horizontal for method (with MenuItemSeparatorView)

- (YJMenu *)initWithMenuFrame:(CGRect)menuframe
                    MenuStyle:(YJMenuStyle)menuStyle
                   ItemTitles:(NSArray *)itemtitles
           ItemSelectedIndexs:(NSArray *)itemSelectedIndexs
        MenuItemSeparatorView:(UIView *)menuItemSeparatorView
                      BgColor:(UIColor *)bgColor
              SelectedBgColor:(UIColor *)selectedBgColor
             NotificationName:(NSString *)notificationName;