Adding Hit/Miss trace source

Also, correcting a bug with modular ContentStore and small update of
docs
diff --git a/docs/source/intro.rst b/docs/source/intro.rst
index bcc3e3f..3453d47 100644
--- a/docs/source/intro.rst
+++ b/docs/source/intro.rst
@@ -116,7 +116,9 @@
 ndnSIM source code should be placed in ``src/ndnSIM`` folder under NS-3 simulator source tree.  For example::
 
 	cd ns-3-dev
-	git clone git://github.com/NDN-Routing/ndnSIM.git ns-3/src/ndnSIM
+	git clone gitolite@git.irl.cs.ucla.edu:ndn/ndnSIM.git ns-3/src/ndnSIM
+
+.. git clone git://github.com/NDN-Routing/ndnSIM.git ns-3/src/ndnSIM
 
 After cloning, a number of patches need to be applied to the base NS-3 to make sure ndnSIM compiles and works::
 
@@ -130,7 +132,7 @@
 
 	mkdir ndnSIM
 	cd ndnSIM
-	git clone git://github.com/cawka/ns-3-dev-ndnSIM.git ns-3
+	git clone gitolite@git.irl.cs.ucla.edu:ndn/ndnSIM.git ns-3/src/ndnSIM
 	git clone git://github.com/cawka/pybindgen.git pybindgen
 	git clone git://github.com/NDN-Routing/ndnSIM.git ns-3/src/ndnSIM