Updated NUnit to version 2.6.3.
Added the ExchangeType property to the appender.

Adds support for specifying the exchange type when the exchange is
declared at startup.  Defaults to "topic" (which is what the previous
version used when declaring the exchange.)
Added the Durable property to the appender.

Sets the exchange durablity property.  Used when the exchange is
declared at startup.  Default value is false.