Update dom-select.js

Added option to sort select list in a dataTable using selected text.

sorting/custom-data-source/dom-select.js

@@ -14,3 +14,15 @@ $.fn.dataTable.ext.order['dom-select'] = function  ( settings, col )
 		return $('select', td).val();
 	} );
 };
+
+/**
+ *  @summary Sort based on the selected text of the `dt-tag select` options in a column
+ *  @author [Somasekar N](somasekar.cse@gmail.com)
+ */
+
+$.fn.dataTable.ext.order['dom-select'] = function  ( settings, col )
+{
+	return this.api().column( col, {order:'index'} ).nodes().map( function ( td, i ) {
+		return $('select :selected', td).val();
+	} );
+};