Use NSUserDefault instead of UserDefault.xml

Author: stevetranby

cocos/base/CCUserDefault-apple.mm

@@ -42,7 +42,7 @@ of this software and associated documentation files (the "Software"), to deal
 // root name of xml
 #define USERDEFAULT_ROOT_NAME    "userDefaultRoot"
 
-#define KEEP_COMPATABILITY
+//#define KEEP_COMPATABILITY
 
 using namespace std;