Added specific handling for clicking on non-existing users. The styling
might need some tweaking (it's pretty ugly), but then again, it's just
for us admins.
The "learn more" links are now actually links, and the location is simply
set using `window.location.ref = url` instead of `window.location.replace()`.
Refactor of pillar-server and pillar-web into a single python package. This
simplifies the overall architecture of pillar applications.
Special thanks @sybren and @venomgfx
