add open and close as noop for people who might be looping over their selects and to self document the methods for extension

js/jquery.mobile.forms.select.js

@@ -199,6 +199,11 @@ $.widget( "mobile.selectmenu", $.mobile.widget, {
 		this.setButtonCount();
 	},
 
+	// open and close preserved in native selects
+	// to simplify users code when looping over selects
+	open: $.noop,
+	close: $.noop,
+
 	disable: function() {
 		this._setDisabled( true );
 		this.button.addClass( "ui-disabled" );