nfd: Update to version 0.3.1

Fixes: #4
diff --git a/nfd/debian/control b/nfd/debian/control
index 314757f..ababa42 100644
--- a/nfd/debian/control
+++ b/nfd/debian/control
@@ -23,7 +23,7 @@
 
 Package: nfd-status-http-server
 Architecture: i386 amd64
-Depends: nfd (= ${binary:Version}), ${misc:Depends}
+Depends: nfd (= ${binary:Version}), ${misc:Depends}, python2.7-minimal
 Description: NFD HTTP status server
 
 Package: nfd-autoreg