Current ng-repeat-reorder implementation breaks html5 table layouts

While using ng-repeat-reorder on a table row `<tr>` element, my table layout was breaking because a div with class name ng-repeat-reorder-parent was automatically be wrapped around the `<tr>` elements. Modern table dom needs nest as follows: `<table>` >> `<tbody>` >> `<tr>`. My solution was to auto-create the div wrapper only if the user has not already assigned this class to an existing element (in my case I would just give `<tbody>` that class).