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/.travis.yml b/.travis.yml
index ebfe01a..08fefa0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -14,13 +14,5 @@
 before_install:
   - travis_retry sudo apt-get install -qq ccache
 script:
-  - |
-    git rm -qrf .
-    git clone --depth=1 https://github.com/cawka/ns-3-dev-ndnSIM.git ns-3
-    git clone --depth=1 https://github.com/cawka/pybindgen.git pybindgen
-    mkdir -p ns-3/src/ndnSIM
-    mv .git ns-3/src/ndnSIM/
-    (cd ns-3/src/ndnSIM/ && git reset -q && git checkout .)
-  - cd ns-3
   - export CXX="ccache $CXX"
-  - ./src/ndnSIM/.jenkins
+  - ./.jenkins