iOS8之后，新的注册通知方式，解决注册通知失败问题

最近项目中的推送失效了，首先发现服务器推送服务报错，是推送证书过期，更新了推送证书和描述文件，但是Pad端接受不到远程推送，首先发现服务器没有接收到pad端发送的deviceToken，那肯定就是注册远程通知时出现问题咯，将代码更新为兼容iOS8之后的通知注册方式，成功！！！
AppDelegate.m

if ([[UIDevice currentDevice].systemVersion floatValue] >= 8.0) {  UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeAlert | UIUserNotificationTypeBadge | UIUserNotificationTypeSound categories:nil];  [application registerUserNotificationSettings:settings];  [application registerForRemoteNotifications];  }  else {      [[UIApplication sharedApplication] registerForRemoteNotificationTypes:UIRemoteNotificationTypeAlert|       UIRemoteNotificationTypeBadge|UIRemoteNotificationTypeSound];  }