Accept either Boolean or string argiuments to register method for iOS

	self.callbackId = [arguments pop];

    UIRemoteNotificationType notificationTypes = UIRemoteNotificationTypeNone;

    id badgeArg = [options objectForKey:@"badge"];

    id soundArg = [options objectForKey:@"sound"];

    id alertArg = [options objectForKey:@"alert"];

    if ([[options objectForKey:@"badge"] isEqualToString:@"true"])

    if ([badgeArg isKindOfClass:[NSString class]])

    {

        if ([badgeArg isEqualToString:@"true"])

            notificationTypes |= UIRemoteNotificationTypeBadge;

    }

    else if ([badgeArg boolValue])

        notificationTypes |= UIRemoteNotificationTypeBadge;

    if ([[options objectForKey:@"sound"] isEqualToString:@"true"])

    if ([soundArg isKindOfClass:[NSString class]])

    {

        if ([soundArg isEqualToString:@"true"])

            notificationTypes |= UIRemoteNotificationTypeSound;

    }

    else if ([soundArg boolValue])

        notificationTypes |= UIRemoteNotificationTypeSound;

    if ([[options objectForKey:@"alert"] isEqualToString:@"true"])

    if ([alertArg isKindOfClass:[NSString class]])

    {

        if ([alertArg isEqualToString:@"true"])

            notificationTypes |= UIRemoteNotificationTypeAlert;

    }

    else if ([alertArg boolValue])

        notificationTypes |= UIRemoteNotificationTypeAlert;

    self.callback = [options objectForKey:@"ecb"];