all: InterestHeader and ContentObjectHeader refactoring to Interest and ContentObject

refs #29
diff --git a/test/ndnSIM-pit.cc b/test/ndnSIM-pit.cc
index c1ba4c1..9eb9cbf 100644
--- a/test/ndnSIM-pit.cc
+++ b/test/ndnSIM-pit.cc
@@ -59,7 +59,7 @@
   SendPacket (const std::string &prefix, uint32_t nonce)
   {
     Ptr<Packet> pkt = Create<Packet> (0);
-    ndn::InterestHeader i;
+    ndn::Interest i;
     i.SetName (Create<ndn::Name> (prefix));
     i.SetNonce (nonce);
     i.SetInterestLifetime (Seconds (0.5));