Increase the delay before restarting instruments after it fails to launch.

Our current approach is not sufficient to restart instruments after a failure:
https://travis-ci.org/inkling/Subliminal/builds/10215980#L1745.
Perhaps a little more time will work.
Merge pull request #62 from inkling/jeff/restart_instruments

Increase the delay before restarting instruments after it fails to launc...