Add bookmark menu to restore previous interact states
Bookmark UI fixes
Add _bookmark method to create bookmarks programmatically
Fixing error handling on interacts and linked cells

• Traceback output from an interact prints inside interact output block
• Kernel is not killed if non-default interact control values or
  linked cells trigger an exception
Print interact state when an exception occurs (fixes #425)
Allow the user to create permalinks with interact values and bookmarks

(fixes gh-404)
Merge remote-tracking branch ‘upstream/master’ into bookmark

Conflicts:
	interact_sagecell.py
Fix indentation error
Make the permalink generator retry in the event of a collision
Get appropriate info for the statistics log messages
get rid of unnecessary printing
Store referer and remote_ip when kernel is requested.
store stats in syslog local3 facility
fix one wrong path now that we switched to git
Revamp installation scripts to make the more modular

This is to prepare for making scripts to install a database server.
fixes in setup scripts
more fixes for database/logging deployment
more fixes for database setup scripts
Fix iptables rules for INPUT
Only store non-nested interacts in permalinks