Replacing #781 - made sure completionBlock called from `SDWebImageManager` is called on the main queue. Created 2 methods to simplify the code for calling the completions
Replacing #781 - made sure completionBlock called from `SDWebImageManager` is called on the main queue. Created 2 methods to simplify the code for calling the completions

geoffmacd/SDWebImage,Kekanto/SDWebImage,dreampiggy/SDWebImage,klundberg/SDWebImage,zhang-yawei/SDWebImage,iheartradio/SDWebImage,smule/SDWebImage,amyhametov/SDWebImage,awkward/SDWebImage,dreampiggy/SDWebImage,dpettigrew/SDWebImage,Frntbac/SDWebImage,awkward/SDWebImage,cochat/SDWebImage,tualatrix/SDWebImage,dreampiggy/SDWebImage,rs/SDWebImage,iosnatarajan/SDWebImage,awkward/SDWebImage,buleSky111/SDWebImage,Insfgg99x/SDWebImage,odyth/SDWebImage,ruaho/SDWebImage,altrooz/SDWebImage