all: InterestHeader and ContentObjectHeader refactoring to Interest and ContentObject

refs #29
diff --git a/model/fw/flooding.h b/model/fw/flooding.h
index c4f6205..5eadabb 100644
--- a/model/fw/flooding.h
+++ b/model/fw/flooding.h
@@ -60,7 +60,7 @@
   // inherited from  Nacks/ForwardingStrategy
   virtual bool
   DoPropagateInterest (Ptr<Face> inFace,
-                       Ptr<const InterestHeader> header,
+                       Ptr<const Interest> header,
                        Ptr<const Packet> origPacket,
                        Ptr<pit::Entry> pitEntry);