don't include memory backend on appengine
don't include memory backend on appengine
shell909090/go-logging,s-kostyaev/go-logging,zj8487/go-logging,yangzhao28/go-logging,d-ulyanov/go-logging,ckeyer/go-log,op/go-logging,giftig/go-logging,mousesun/go-logging,alecthomas/go-logging