Also, this commit imports used classes from ::ndn namespace (from NDN-CPP library) directly to ::nfd namespace. refs: #1163 Change-Id: I9cc9d72e00af495b4ed0c84e6d418a7c9ba986cb
refs #1119 (http://redmine.named-data.net/issues/1119) Change-Id: I1783857452941794a2538534d3492d30ac58dd25
refs #1148 Change-Id: I19c3d2f9b638797a6a36ce41a98be4463b4b7a2d