use an array for verbs

Docker-DCO-1.1-Signed-off-by: Victor Vieux <vieux@docker.com> (github: vieux)
.travis.yml

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
Run godep

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>