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/face/channel-factory.hpp b/daemon/face/channel-factory.hpp
index a2d7ff9..184703a 100644
--- a/daemon/face/channel-factory.hpp
+++ b/daemon/face/channel-factory.hpp
@@ -9,7 +9,7 @@
 
 #include "common.hpp"
 
-namespace ndn {
+namespace nfd {
 
 /**
  * \brief Base class for all channel factories
@@ -34,6 +34,6 @@
   ChannelMap m_channels;  
 };
 
-} // namespace ndn
+} // namespace nfd
 
 #endif // NFD_FACE_CHANNEL_FACTORY_HPP