* Version 2.4 released 2010-03-16

  * Fix bug in ykval-checksum-clients.php when used with PostgreSQL.

* Version 2.3 released 2010-03-12

  * Add ykval-checksum-clients.php, see doc/SyncMonitor.wiki.

* Version 2.2 released 2010-02-22

  * Minor cleanups and fixes.

  * Add ykval-revoke.php service, see doc/RevocationService.wiki.

* Version 2.1 released 2010-01-29

  * Minor cleanups and fixes.

* Version 2.0 released 2010-01-18

  * Major re-design to support a new architecture with replicated
    servers.

* Version 1.1 released 2009-11-19

  * Stable release of non-replicated server.