AdWhirl/iPhone concurrency - does not send appId about adwhirl HOT 5 CLOSED

For the appid, the AdWhirlView simply calls the delegate's 
adWhirlApplicationKey method. The only way I can think of that it can be null 
is when the delegate method return nil. The AdWhirl code is very simple and I 
can't think of any situation, multiple adwhirl spots or not, that can cause the 
appid to be nil other than that the app delegate returns nil for 
adWhirlApplicationKey. In which case, it's the delegates responsibility to 
return a proper appid. So for this it doesn't seem like there's anything for us 
to fix.

Fixed in 2.6.1