model: Enabling face operations based on NFD's face

Refs: #2215
diff --git a/model/ndn-common.hpp b/model/ndn-common.hpp
index 97e722a..8b1a692 100644
--- a/model/ndn-common.hpp
+++ b/model/ndn-common.hpp
@@ -22,6 +22,8 @@
 
 #include "ns3/nstime.h"
 #include "ns3/simulator.h"
+#include "ns3/attribute.h"
+#include "ns3/attribute-helper.h"
 
 #include <ndn-cxx/interest.hpp>
 #include <ndn-cxx/encoding/block.hpp>
@@ -39,6 +41,8 @@
 using ::ndn::Name;
 namespace name = ::ndn::name;
 
+ATTRIBUTE_HELPER_HEADER(Name);
+
 namespace time = ::ndn::time;
 
 using ::ndn::Exclude;