Add comment for setting the backgroundColor in ASImageNode
Add comment for setting the backgroundColor in ASImageNode

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