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
fix exception if row contains null value
Support for hiding output.

This commit adds extra functionality in the notebook and at the
paragraph level to selectively hide/show the output.  This is useful
when the output is of little importance, for example, a bunch of imports
or declarations for which the Scala REPL output is redundant.
Fix javascript typo
Added paragraph button for show/hide output.  Removed this toggle from paragraph drop down
sort notes by name
Make sparkcontext stay alive when doing unittests
Fix bug that take wrong default interpreter
Merge pull request #166 from jburet/master

fix exception if row contains null value
Merge pull request #174 from NFLabs/fix_exception_row_contains_null

Fix broken unittest.
format number in table
Merge branch 'master' into handle_finish_with_comment
Add print("") in the always to make sure not finishing with comment
Double quote to single quote
better comment
Implement ZeppelinContext.run() to programtically run any code as a paragraph
Merge pull request #172 from coolfrood/topic/support-for-hiding-output

Support for hiding output.
Merge pull request #175 from NFLabs/format_number

Format number in table
Prevent setting empty looknfeel