core: move common.hpp to core/

Headers in core/ are now included as `#include "core/*.hpp"`.
This allows NFD to rely less on include paths when used as a submodule in
another codebase, such as ndnSIM and NFD-Android.

refs #3127

Change-Id: Ia38f3c97427e17ff7b5401281f1fe875b5d5313e
diff --git a/daemon/table/dead-nonce-list.hpp b/daemon/table/dead-nonce-list.hpp
index 1c7f7cc..050da35 100644
--- a/daemon/table/dead-nonce-list.hpp
+++ b/daemon/table/dead-nonce-list.hpp
@@ -1,12 +1,12 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /**
- * Copyright (c) 2014,  Regents of the University of California,
- *                      Arizona Board of Regents,
- *                      Colorado State University,
- *                      University Pierre & Marie Curie, Sorbonne University,
- *                      Washington University in St. Louis,
- *                      Beijing Institute of Technology,
- *                      The University of Memphis
+ * Copyright (c) 2014-2016,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
  *
  * This file is part of NFD (Named Data Networking Forwarding Daemon).
  * See AUTHORS.md for complete list of NFD authors and contributors.
@@ -26,7 +26,7 @@
 #ifndef NFD_DAEMON_TABLE_DEAD_NONCE_LIST_HPP
 #define NFD_DAEMON_TABLE_DEAD_NONCE_LIST_HPP
 
-#include "common.hpp"
+#include "core/common.hpp"
 #include <boost/multi_index_container.hpp>
 #include <boost/multi_index/sequenced_index.hpp>
 #include <boost/multi_index/hashed_index.hpp>