travis: tail the logs when we spit them out to the output
travis: tail the logs when we spit them out to the output

They're too big to display via the CI web UIs and we're mostly
interested in the bottom.

dhruvsinghal/watchman,dhruvsinghal/watchman,wez/watchman,facebook/watchman,facebook/watchman,wez/watchman,wez/watchman,kwlzn/watchman,facebook/watchman,kwlzn/watchman,nodakai/watchman,facebook/watchman,kwlzn/watchman,kwlzn/watchman,wez/watchman,facebook/watchman,nodakai/watchman,dhruvsinghal/watchman,nodakai/watchman,nodakai/watchman,wez/watchman,nodakai/watchman,wez/watchman,dhruvsinghal/watchman,kwlzn/watchman,wez/watchman,dhruvsinghal/watchman,kwlzn/watchman,wez/watchman,kwlzn/watchman,nodakai/watchman,facebook/watchman,facebook/watchman,dhruvsinghal/watchman,dhruvsinghal/watchman,facebook/watchman,dhruvsinghal/watchman,nodakai/watchman,nodakai/watchman,facebook/watchman,wez/watchman,nodakai/watchman