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/model/cs/content-store-with-freshness.hpp b/model/cs/content-store-with-freshness.hpp
index 3d4d980..4cfa700 100644
--- a/model/cs/content-store-with-freshness.hpp
+++ b/model/cs/content-store-with-freshness.hpp
@@ -78,7 +78,7 @@
 
 template<class Policy>
 LogComponent ContentStoreWithFreshness<Policy>::g_log = LogComponent(("ndn.cs.Freshness."
-                                                                      + Policy::GetName()).c_str());
+                                                                      + Policy::GetName()).c_str(), __FILE__);
 
 template<class Policy>
 TypeId