MIME: added application/xspf+xml MIME type (ticket #479).

conf/mime.types

diff --git a/conf/mime.types b/conf/mime.types
index a6bc016..89be9a4 100644
--- a/conf/mime.types
+++ b/conf/mime.types
@@ -55,6 +55,7 @@
     application/x-x509-ca-cert            der pem crt;
     application/x-xpinstall               xpi;
     application/xhtml+xml                 xhtml;
+    application/xspf+xml                  xspf;
     application/zip                       zip;
 
     application/octet-stream              bin exe dll;