model+apps+utils+examples+ci+docs: Update code for changes in ns-2.23

- Replace removed RandomVariable with RandomVariableStream
- Replace deprecated usages of AddTraceSource
- Update changed LogComponent interface

ci: This commit also integrates a script for Jenkins and Travis CI to
clone NS-3 and pybindgen repositories, so the code can be built.

docs: Update to reflect new home of ndnSIM and related sources

Change-Id: Ic14e1269bf15366b0041fd670c577053b6704dc7
Refs: #3122, #3123
diff --git a/utils/topology/rocketfuel-map-reader.hpp b/utils/topology/rocketfuel-map-reader.hpp
index 3cf5ee2..1c089f0 100644
--- a/utils/topology/rocketfuel-map-reader.hpp
+++ b/utils/topology/rocketfuel-map-reader.hpp
@@ -25,7 +25,6 @@
 #include "annotated-topology-reader.hpp"
 
 #include "ns3/net-device-container.h"
-#include "ns3/random-variable.h"
 #include "ns3/data-rate.h"
 
 #include <set>
@@ -147,7 +146,7 @@
   ConnectBackboneRouters();
 
 private:
-  UniformVariable m_randVar;
+  Ptr<UniformRandomVariable> m_randVar;
 
   NodeContainer m_backboneRouters;
   NodeContainer m_gatewayRouters;