Add: populate and sort function.

[KyleScharnhorst]

provided a method that can help correctly order chosen elements in their desired order from a model that was returned from the server. Elements need to have the selected prop and the data-sortindex attr with the correct index. then call the populateAndSort method.

example:

            var options = $('#my_report_options').bootstrapDualListbox({
                sortByInputOrder: true
            });

            var sort_index = 0;
            $('#my_report_selections').children().each(function () {
                var target = this.label;
                $('#my_report_options').children().each(function () {
                    if (this.label == target) {
                        $(this).prop("selected", true);
                        $(this).attr("data-sortindex", sort_index++);
                    }
                });
            });

            options.bootstrapDualListbox("populateAndSort", sort_index);