NFLabs/zeppelin — pull request #249 by Leemoonsoo (2014-12-16 00:08:38+00:00)
Title: Improve zeppelin-daemon.sh script behavior.

Some behavior of zeppelin-daemon.sh is changed after #236 .
This PR bringing back some good to have behaviors

* [x] already running / already stopped does not considered as failure. (make `zeppelin-daemon.sh restart` success when zeppelin is not running)
* [x] returning non zero exit code when something went wrong.

Ready to merge.