[doap-interest] wrong mime type for doap

[Story Henry]

The mime type for rdf/xml should be application/rdf+xml .
Is this something one could fix?

hjs at bblfish:1$ curl -i http://usefulinc.com/ns/doap | head
   % Total    % Received % Xferd  Average Speed   Time    Time      
Time  Current
                                  Dload  Upload   Total   Spent     
Left  Speed
  14 27084   14  3912    0     0   3684      0  0:00:07  0:00:01   
0:00:06 10957HTTP/1.1 200 OK
Server: nginx/0.5.33
Date: Tue, 18 Nov 2008 10:03:56 GMT
Content-Type: application/octet-stream
Content-Length: 27084
Last-Modified: Thu, 10 Jul 2008 11:59:27 GMT
Connection: keep-alive
Accept-Ranges: bytes

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"

Henry

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