[bootstrap-table] use of data-sort-name

[Costas]

When user press a column to sort, define another column as source.

//http://jsfiddle.net/e3nk137y/9602/
[TABLE]
    [TD]
        [TR]
            [TD]Item[/TD]
            [TD]Date[/TD]
            [TD]Type[/TD]
            [TD]DateVAL[/TD]
        [/TR]
    
    
        [TR]
            [TD]Pear [/TD]
            [TD]January[/TD]
            [TD]Fruit[/TD]
            [TD]1[/TD]
        [/TR]
        [TR]
            [TD]Carrot[/TD]
            [TD]March[/TD]
            [TD]Vegetable[/TD]
            [TD]3[/TD]
        [/TR]
        [TR]
            [TD]Apple [/TD]
            [TD]February[/TD]
            [TD]Fruit[/TD]
            [TD]2[/TD]
        [/TR]
    
[/TABLE]

doc - http://bootstrap-table.wenzhixin.net.cn/documentation/