Event: Copy detail property to jQuery.Event on native events

Fixes gh-1867
(cherry picked from commit d9ed166c865e91ccc8cef1ca282785c500ca2306)

Conflicts:
   test/unit/event.js

src/event.js

@@ -528,7 +528,7 @@ jQuery.event = {
 	},
 
 	// Includes some event props shared by KeyEvent and MouseEvent
-	props: ( "altKey bubbles cancelable ctrlKey currentTarget eventPhase " +
+	props: ( "altKey bubbles cancelable ctrlKey currentTarget detail eventPhase " +
 		"metaKey relatedTarget shiftKey target timeStamp view which" ).split(" "),
 
 	fixHooks: {},