travis: use 1.8 final, do e2e tests from 1.8, not 1.6 (#223)
travis: use 1.8 final, do e2e tests from 1.8, not 1.6 (#223)


danicat/golang-samples,danicat/golang-samples,adamyanliev/golang-samples,GoogleCloudPlatform/golang-samples,adamyanliev/golang-samples,GoogleCloudPlatform/golang-samples,adamyanliev/golang-samples,adamyanliev/golang-samples,GoogleCloudPlatform/golang-samples,danicat/golang-samples