model: Another major change: switching to NDN.cxx API for ndn::Name

NDN.cxx code is almost exactly the same, with minor NS-3 specific customizations

Refs #1011 (http://redmine.named-data.net/issues/1011)
diff --git a/examples/custom-apps/custom-app.cc b/examples/custom-apps/custom-app.cc
index 80652ba..4e83095 100644
--- a/examples/custom-apps/custom-app.cc
+++ b/examples/custom-apps/custom-app.cc
@@ -59,8 +59,8 @@
 
   // Create a name components object for name ``/prefix/sub``
   Ptr<ndn::Name> prefix = Create<ndn::Name> (); // now prefix contains ``/``
-  prefix->Add ("prefix"); // now prefix contains ``/prefix``
-  prefix->Add ("sub"); // now prefix contains ``/prefix/sub``
+  prefix->append ("prefix"); // now prefix contains ``/prefix``
+  prefix->append ("sub"); // now prefix contains ``/prefix/sub``
 
   /////////////////////////////////////////////////////////////////////////////
   // Creating FIB entry that ensures that we will receive incoming Interests //