Simple Lookup to Bing for their ReverseGeocoder

bingReverseGeocode.swift

class func bingReverseGeocode(inout location: CLLocation,
                              callback: (CLLocation) -> Void) {
    var bingAPIKey = "ABCDEF-1234567890"
    var lat = location.coordinate.latitude
    var lon = location.coordinate.longitude
    var u = "http://dev.virtualearth.net/REST/v1/Locations/\(lat),\(lon)?o=json&key=\(bingAPIKey)"
    var url = NSURL(string: u)
    var request: NSURLRequest = NSURLRequest(URL: url!)
    let session = NSURLSession.sharedSession()
    let task = session.dataTaskWithURL(url!, completionHandler: {data, response, error -> Void in
        if(error != nil) {
            // If there is an error in the web request, print it to the console
            println(error.localizedDescription)
        }
        var err: NSError?
        // Uses SiftyJSON https://github.com/SwiftyJSON/SwiftyJSON
        var j = JSON(data: data)
        var place = j["resourceSets"][0]["resources"][0]["name"].stringValue
        var address = j["resourceSets"][0]["resources"][0]["address"]["locality"].stringValue
        var displayName = (address != "") ? address : ((place != "") ? place : "Unknown Location")
        cluster.displayName = displayName
        dispatch_async(dispatch_get_main_queue(), {
            callback(cluster)
        })
    })
    task.resume()
}