Project documentation updated.

We have improved the installation text, added more details and updated
that to consider Glassfish 3.1.2, the most recent release.
PDF documentation updated.
Bug on the registration of the first user fixed.
Part of the web agregator implemented.

Starting from the list of member's websites, it load the html content
of the site, search for a feed url, load the feed using Rome e present
the feed in the user interface. In the user interface, it's possible to
reference the website in order to start collecting content from its
feed.