refractor updating notebook.
* try to remove double for-loop as possible for performance
* remove duplicated actions (move paragraph while deleting paragraph)
* better readability
fix indentation and typo
Merge pull request #205 from NFLabs/refactor-updating-notebook

Refactor updating notebook
Fix problem finding war
Let zeppelin-env.sh define jvm mem option using ZEPPELIN_MEM.
Add ZEPPELIN_JAVA_OPTS example in zeppelin-env.sh.template
rewrite for cleaner codes
Merge pull request #210 from NFLabs/minor-refactor

rewrite for cleaner codes
Merge pull request #209 from NFLabs/fix/daemon-script

Fix/Improve daemon script
Merge Master Branch + Fix JSHint