I am downloading a file using Alamofire download with progress but i have no idea how to pause / resume / cancel the specific request.

```
@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
}

```