destroy isn't removing all event handlers

[zspitzer]

the current approach in the destroy method doesn't remove all the bound event handlers

$(window).off(namespace); only removes event handlers bound to the window object
https://github.com/rstaib/jquery-bootgrid/blob/master/dist/jquery.bootgrid.js#L1443

as you can see from the output here https://jsbin.com/xavosu/edit?js,output in the console, after destroy there are 8 handlers remaining

at the moment, every LI and TD a.sort header in the table has an individual handler, it probably would be simpler to bind to the TR.header and UL.dropdown-menu's and then check event.currentTarget

[zspitzer]

I think it's being caused by

$(item).before(element.clone(true)).remove();
https://github.com/rstaib/jquery-bootgrid/blob/master/dist/jquery.bootgrid.js#L886

remove the clone seems to fix the problem