Update CCDirectorCaller.mm

First destroy CCDirector instance with  cocos2d::CCDirector::sharedDirector()->end() 

Then create new CCDirector instance with
cocos2d::CCApplication::sharedApplication()->run();

APP will crash at 
CCApplication::setAnimationInterval

[[CCDirectorCaller sharedDirectorCaller] setAnimationInterval: interval ];

cocos2dx/platform/ios/CCDirectorCaller.mm

@@ -51,6 +51,7 @@ static id s_sharedDirectorCaller;
 +(void) destroy
 {
     [s_sharedDirectorCaller release];
+    s_sharedDirectorCaller = nil;
 }
 
 -(void) alloc