Dispatch deallocation of UIImage on background thread
Dispatch deallocation of UIImage on background thread

Destruction of bigger images in ASNetworkImageNode on the main thread can be expensive and can take some time, so we dispatch onto a background queue to actually dealloc.

george-gw/AsyncDisplayKit,rcancro/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,samhsiung/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,facebook/AsyncDisplayKit,lappp9/AsyncDisplayKit,maicki/AsyncDisplayKit,JetZou/AsyncDisplayKit,maicki/AsyncDisplayKit,levi/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,facebook/AsyncDisplayKit,maicki/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,lappp9/AsyncDisplayKit,harryworld/AsyncDisplayKit,rcancro/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,harryworld/AsyncDisplayKit,bimawa/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,flovouin/AsyncDisplayKit,rcancro/AsyncDisplayKit,harryworld/AsyncDisplayKit,JetZou/AsyncDisplayKit,flovouin/AsyncDisplayKit,gazreese/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,smyrgl/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,eanagel/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,romyilano/AsyncDisplayKit,Xinchi/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,marmelroy/AsyncDisplayKit,rmls/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,facebook/AsyncDisplayKit,marmelroy/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,lappp9/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,harryworld/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,levi/AsyncDisplayKit,yufenglv/AsyncDisplayKit,JetZou/AsyncDisplayKit,george-gw/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,rmls/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,smyrgl/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,romyilano/AsyncDisplayKit,rcancro/AsyncDisplayKit,yufenglv/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,romyilano/AsyncDisplayKit,Xinchi/AsyncDisplayKit,george-gw/AsyncDisplayKit,rmls/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,JetZou/AsyncDisplayKit,gazreese/AsyncDisplayKit,yufenglv/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,eanagel/AsyncDisplayKit,eanagel/AsyncDisplayKit,Xinchi/AsyncDisplayKit,Xinchi/AsyncDisplayKit,Xinchi/AsyncDisplayKit,bimawa/AsyncDisplayKit,Adlai-Holler/AsyncDisplayKit,maicki/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,garrettmoon/AsyncDisplayKit,eanagel/AsyncDisplayKit,yufenglv/AsyncDisplayKit,smyrgl/AsyncDisplayKit,harryworld/AsyncDisplayKit,gazreese/AsyncDisplayKit,george-gw/AsyncDisplayKit,samhsiung/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,maicki/AsyncDisplayKit,facebook/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,lappp9/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,rcancro/AsyncDisplayKit,rmls/AsyncDisplayKit,bimawa/AsyncDisplayKit,samhsiung/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,aaronschubert0/AsyncDisplayKit,levi/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,bimawa/AsyncDisplayKit,flovouin/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,JetZou/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,samhsiung/AsyncDisplayKit,chrisdanford/AsyncDisplayKit,levi/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,eanagel/AsyncDisplayKit,marmelroy/AsyncDisplayKit,flovouin/AsyncDisplayKit,tomizimobile/AsyncDisplayKit,marmelroy/AsyncDisplayKit,nrcmedia/AsyncDisplayKit,rmls/AsyncDisplayKit,yufenglv/AsyncDisplayKit,rahul-malik/AsyncDisplayKit,smyrgl/AsyncDisplayKit,jellenbogen/AsyncDisplayKit,levi/AsyncDisplayKit,flovouin/AsyncDisplayKit,hannahmbanana/AsyncDisplayKit,romyilano/AsyncDisplayKit,gazreese/AsyncDisplayKit