servers: modified the DIR to serve a vivaldi status page via /vivaldi.html...

servers: modified the DIR to serve a vivaldi status page via /vivaldi.html (including /vivaldi-d3.js) and raw coordinate data via /vivaldi.data.

git-svn-id: https://xtreemfs.googlecode.com/svn/trunk@2904 f8528748-c2c0-11dd-ba5c-d3b7c2b3b534