@IBAction func downloadBtnTapped() {

 Alamofire.download(.GET,"http://httpbin.org/stream/100",destination: destination)
     .progress { (bytesRead,totalBytesRead,totalBytesExpectedToRead) in
         println(totalBytesRead)
     }
     .response { (request,response,_,error) in
         println(response)
     }
}


@IBAction func pauseBtnTapped(sender : UIButton) {        
    // i would like to pause/cancel my download request here
}