Update "stable" to latest releases (#923)
Update "stable" to latest releases (#923)

- istio to v0.2.0 of serving

- build to v0.2.0

- serving to v0.2.0

- eventing to v20181031-a2f9417
markfisher/sk8s,markfisher/sk8s,markfisher/sk8s,markfisher/sk8s