Add missing delegate method implementation for demo app
Add missing delegate method implementation for demo app

ramoslin02/FastImageCache,libiao88/FastImageCache,georgekola/FastImageCache,lucatorella/FastImageCache,yimouleng/FastImageCache,zjh171/FastImageCache,xb123456456/FastImageCache,erysaj/FastImageCache,donholly/FastImageCache,appone/FastImageCache,gaurav1981/FastImageCache,nKey/FastImageCache,lucatorella/FastImageCache,zilaiyedaren/FastImageCache,UIKit0/FastImageCache,wangmb/FastImageCache,goodheart/FastImageCache,DeskConnect/FastImageCache,King-of-Monkey/FastImageCache,hyperspacemark/FastImageCache,rock88/FastImageCache,jaredsinclair/FastImageCache,hunhu/FastImageCache,path/FastImageCache,DZNS/FastImageCache,irealme/FastImageCache,appone/FastImageCache,globchastyy/FastImageCache,wonderkiln/FastImageCache,dcaunt/FastImageCache,donholly/FastImageCache,gank0326/FastImageCache,wonderkiln/FastImageCache,znatz/FastImageCache,indraj/FastImageCache,lydonchandra/FastImageCache