Github user nberserk commented on the pull request:
https://github.com/apache/incubator-zeppelin/pull/168#issuecomment-128716633
the button is moved to notebook level.

in summary, this pull request does:
1. save timer; after 10sec `saveNote` will be called. `saveNote` will
invoke `saveParagraph`. only paragraph has dirty text(delta) will be saved
2. save button in note; save button will not be shown when no change in note
3. if the paragraph's result is outdated by editing , it will add
'(outdated)' msg to the end of execution time description. (see above
screenshot)
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