*Title: New content search

Incentive:
To make it simpler for the user to get an overview of the content which 
has been published/modified since his last visit to the site.

*Documentation:

When the user is logged in he will be able to access the link /content/new. This 
page will display a template which has a variable {$last_visit_timestamp} which can
be used to fetch the content which has been published since the user last visited the site.

The default template will list any content the user has permissions to read, no filtering is
done by default.

The logic for storing the last visit is based on two things:
* When a user logs in we store the last visit timestamp
* When a users session times out (idle timeout) we update the last visit timestamp

*Testing:

Make sure that the last visited time is actually stored when a user logs in.

Make sure that the timestamp is updated when the users idle time ends ( ActivityTimeout 
is used for timeout value ).

*SVN Revisions: