Unit test to check if zeppelin handles ending comment.
issue addressed https://github.com/NFLabs/zeppelin/issues/151
Merge branch 'master' into handle_finish_with_comment
Basic key, value selection by drag and drop
implement pivot function
Ability to change aggregation function per value
Multiple same value with different aggregations.
Add avg aggregation.
Integration with NFLabs slack was added
Take care of piechart
Beautifulize graph option
Fix value data reading
Remove some jshint warnings
Merge branch 'master' into pivot

Conflicts:
	zeppelin-web/app/scripts/controllers/notebook.js
Merge pull request #159 from NFLabs/pivot

Pivot
Merge pull request #160 from bzz/feature/encrypted-slack-integration

CI: Travis integration with Slack
Increase shell execution timeout
Merge pull request #162 from NFLabs/increase_sh_timeout

Increase shell execution timeout
Don't concat and minify looknfeel css in war package
Fix typo
Merge pull request #164 from NFLabs/dist_looknfeel

Look n feel does not work after packaging zeppelin-web
fix exception if row contains null value