Fixed up compilation errors due to AFError refactors in Alamofire.
Fixed up compilation errors due to AFError refactors in Alamofire.

daniele-pizziconi/AlamofireImage,Alamofire/AlamofireImage,daniele-pizziconi/AlamofireImage,Alamofire/AlamofireImage,sessuru/AlamofireImage,Pluto-tv/AlamofireImage,Pluto-tv/AlamofireImage,sessuru/AlamofireImage