Stop requiring certain namespaces in atom feeds
Stop requiring certain namespaces in atom feeds

This fixes feeds that use the purl namespace, but work just fine.

elancom/goread,wangjun/goread,P7h/goread,P7h/goread,P7h/goread,Feitianyuan/goread,mgaitan/goread,lnmx/goread,mjibson/goread,lnmx/goread,wangjun/goread,youprofit/goread,doublehou/goread,mgaitan/goread,beni55/goread,elancom/goread,beni55/goread,mjibson/goread,doublehou/goread,beni55/goread,elancom/goread,Feitianyuan/goread,mikecb/goread,mgaitan/goread,wangjun/goread,doublehou/goread,youprofit/goread,mikecb/goread,mjibson/goread,youprofit/goread,lnmx/goread,Feitianyuan/goread,mikecb/goread