Merge pull request #3 from jbencook/v4

adding encryption for ipynb
Add password to iPython notebook profile
Fix some bugs in ipynb/init.sh.
Fix bug where saving to wrong file.
checking for .//setup.sh to avoid warning when it doesn't exist. This should fix alexdebrie/spark-flask#20
Setting hostname for ssl cert. Should fix alexdebrie/spark-flask#15