Added docstrings to all public APIs in the UIImageView extension file.
Added docstrings to all public APIs in the UIImageView extension file.

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