src: Changing namespace ndn to namespace nfd

Also, this commit imports used classes from ::ndn namespace (from
NDN-CPP library) directly to ::nfd namespace.

refs: #1163

Change-Id: I9cc9d72e00af495b4ed0c84e6d418a7c9ba986cb
diff --git a/daemon/fw/forwarder.cpp b/daemon/fw/forwarder.cpp
index e47fb5f..15881e3 100644
--- a/daemon/fw/forwarder.cpp
+++ b/daemon/fw/forwarder.cpp
@@ -6,7 +6,7 @@
 
 #include "forwarder.hpp"
 
-namespace ndn {
+namespace nfd {
 
 Forwarder::Forwarder(boost::asio::io_service& ioService)
 {
@@ -33,4 +33,4 @@
 {
 }
 
-} // namespace ndn
+} // namespace nfd