src: Another round of source updates: moving all headers close to implementation files

Change-Id: I3d47076504950e67746174623c75383948e9d93d
diff --git a/src/face.cpp b/src/face.cpp
index 45d577b..9385358 100644
--- a/src/face.cpp
+++ b/src/face.cpp
@@ -5,7 +5,7 @@
  * See COPYING for copyright and distribution information.
  */
 
-#include <ndn-cpp-dev/face.hpp>
+#include "face.hpp"
 
 using namespace std;