Links to Vysper 0.5 release are broken

[Jean-Sebastien Delfino]

The download links on 
http://mina.apache.org/vysper/apache-vysper-05-release.html are broken.

I know this is an old release, but you may want to fix these links, or 
perhaps indicate that 0.5 is not available for download anymore.

--
Jean-Sebastien