WP Session Manager

Adds $_SESSION functionality to WordPress, leveraging the database where needed to power multi-server installations.

Every visitor, logged in or not, will be issued a session. Session data will be stored in the WordPress database by default
to deal with load balancing issues if multiple application servers are being used. In addition, the session collection will
also be stored in memory for rapid use within WordPress.

Session data stored in the database can be encrypted at rest for better security.