Added debug output to track down the random image filter race condition.
Added debug output to track down the random image filter race condition.

Baza207/AlamofireImage,liric28/AlamofireImage,Edubits/AlamofireImage,easyui/AlamofireImage,MattKiazyk/AlamofireImage,androiddream/AlamofireImage,sai43/AlamofireImage,kcharwood/AlamofireImage,easyui/AlamofireImage,androiddream/AlamofireImage,hejunbinlan/AlamofireImage,jinjian1991/AlamofireImage,hejunbinlan/AlamofireImage,carabina/AlamofireImage,daniele-pizziconi/AlamofireImage,Pluto-tv/AlamofireImage,augmify/AlamofireImage,kcharwood/AlamofireImage,Edubits/AlamofireImage,sai43/AlamofireImage,bestwpw/AlamofireImage,liric28/AlamofireImage,Baza207/AlamofireImage,voidException/AlamofireImage,mokey1422/AlamofireImage,alexanderedge/AlamofireImage,MattKiazyk/AlamofireImage,jackywpy/AlamofireImage,zdw19840929/AlamofireImage,Pluto-tv/AlamofireImage,jackywpy/AlamofireImage,zdw19840929/AlamofireImage,sessuru/AlamofireImage,bestwpw/AlamofireImage,Alamofire/AlamofireImage,daniele-pizziconi/AlamofireImage,carabina/AlamofireImage,alexanderedge/AlamofireImage,jinjian1991/AlamofireImage,sessuru/AlamofireImage,Alamofire/AlamofireImage,augmify/AlamofireImage,mokey1422/AlamofireImage,voidException/AlamofireImage