Fix for issue 2315 - Flip toggle switch with change event bound, triggers multiple times

- Modified refresh() so that it checks to see if the value actually changed before firing off the "change" event.

js/jquery.mobile.forms.slider.js

@@ -284,13 +284,17 @@ $.widget( "mobile.slider", $.mobile.widget, {
 		}
 
 		if ( !preventInputUpdate ) {
+			var valueChanged = false;
+
 			// update control"s value
 			if ( cType === "input" ) {
+				valueChanged = control.val() !== newval;
 				control.val( newval );
 			} else {
+				valueChanged = control[ 0 ].selectedIndex !== newval;
 				control[ 0 ].selectedIndex = newval;
 			}
-			if ( !isfromControl ) {
+			if ( !isfromControl && valueChanged ) {
 				control.trigger( "change" );
 			}
 		}