ACTION-233 Make sure Jagatic et al on social phishing is in SharedBookmarks

This reference was on the shared bookmarks page, so I am closing this
action (if only they were all this easy!).  I also added two more
recent papers by Jakobsson:

 - The Human Factor in Phishing, Markus Jakobsson, To appear in
Privacy & Security of Consumer Information '07

- Designing and Conducting Phishing Experiments, P. Finn and M.
Jakobsson. To appear in IEEE Technology and Society Magazine, Special
Issue on Usability and Security

Rachna