Added a 'top' attribute of 3 to the default error export.  

This resolves issues with unique exceptions that have ORM objects, and provides no
impact on standard exceptions.  Sometimes (very seldom) there are exceptions that also contain ORM objects.  By not having the TOP argument, the cfdump will recursively look through those entities and eventually crash the server.

Because standard exceptions don't go more than 1 level deep this shouldn't cause any issues.