     }
 }
 
-let ResponseDelegateKey = "responseDelegateObject"
+private let ResponseDelegateKey = "responseDelegateObject"
 
 class NetworkOperation: NSOperation {
     

        }
        //Check the response code and react appropriately
        completionHandler(.Allow)
    }
    
    func URLSession(session: NSURLSession, didReceiveChallenge challenge: NSURLAuthenticationChallenge, completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) -> Void) {
        completionHandler(.PerformDefaultHandling, nil)

    }
    
    var data: NSData {
        if let data = _incomingData {
           return NSData(data: data)
        }
        return NSData()
    }
    
    private var _incomingData: NSMutableData? = nil
    
    var error: NSError?
    
