     }
     
     init() {
-        lastVersionCheckPerformedOnDate = NSUserDefaults.standardUserDefaults().objectForKey(self.sirenDefaultStoredVersionCheckDate) as? NSDate;
+        lastVersionCheckPerformedOnDate = NSUserDefaults.standardUserDefaults().objectForKey(sirenDefaultStoredVersionCheckDate) as? NSDate;
     }
     
     // MARK: Check Version

            alertController.view.tintColor = alertControllerTintColor
        }
    
        switch self.alertType {
            case .Force:
                alertController.addAction(updateAlertAction());
            case .Option:

        
        var storeURLString = "https://itunes.apple.com/lookup?id=\(appID!)"
        
        if let countryCode = countryCode {
            storeURLString += "&country=\(countryCode)"
        }
        
