Planned www and api maintenance

Our webserver (www) and one server (api) out of our five validation servers will be upgraded between Thu Apr 12 06:00:00 UTC 2012 and Thu Apr 12 12:00:00 UTC 2012. The machines will only be unavailable for a short period of time (minutes). There will be no service interruption for the validation service if you use the version 2 interface.