This code doesn't compile with the latest iteration of Swift.

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let baseURL = NSURL(string: "https://api.forecast.io/forecast/\(apiKey)/")


        if let forecastURL = NSURL(string: "37.8267,-122.423", relativeToURL: baseURL) {


            let sharedSession = NSURLSession.sharedSession()

            let downloadTask: NSURLSessionDownloadTask = sharedSession.downloadTaskWithURL(forecastURL, completionHandler: { (location: NSURL!, response: NSURLResponse!, error: NSError!) -> Void in


                if (error == nil) {
                    if let dataObject = NSData(contentsOfURL: location) {

                    let weatherDictionary: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataObject, options: nil, error: nil) as NSDictionary

                    println(weatherDictionary)

                    }
                }
            })

            downloadTask.resume()
        }
    }