Upgrade the underlying NFD and ndn-cxx to version 0.6.0

Compilation is currently broken and is fixed in the following commit

Change-Id: Ic0dba06a9afd66a810172d4a512f35f6df6b25a2
Refs: #4306
diff --git a/README.md b/README.md
index 01c7a7c..883b7ae 100644
--- a/README.md
+++ b/README.md
@@ -12,12 +12,12 @@
 - ndnSIM uses implementation of basic NDN primitives from
   [ndn-cxx library (NDN C++ library with eXperimental eXtensions)](http://named-data.net/doc/ndn-cxx/)
 
-  Based on version `0.4.1`
+  Based on version `0.6.0`
 
 - All NDN forwarding and management is implemented directly using source code of
   [Named Data Networking Forwarding Daemon (NFD)](http://named-data.net/doc/NFD/)
 
-  Based on version `0.4.1-1-g704430c`
+  Based on version `0.6.0`
 
 - Allows [simulation of real applications](http://ndnsim.net/guide-to-simulate-real-apps.html)
   written against ndn-cxx library