Minor improvement to the comment about testInterface.  Explains what should be passed in as the interface.
Minor improvement to the comment about testInterface.  Explains what
should be passed in as the interface.

sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia,sparkslabs/kamaelia