Logout wait for synchronous network requests.

gistfile1.txt

                dispatch_async(dispatch_get_main_queue(), ^{
                    [self.dialog setTitleString:@"Logging Out..."];
                    <Show Dialog>
                 });
            
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

#warning This would be better if our Network Utility ran off of the delegate protocol so we could cancel Network Requests.                
                do {
                    usleep(NSEC_PER_MSEC);
                } while ([UIApplication sharedApplication].networkActivityIndicatorVisible);
                
                usleep(NSEC_PER_MSEC);
                
                dispatch_async(dispatch_get_main_queue(), ^{
                    <Dismiss HUD>
                    <Continue Logout>
                });
            });