Added ns run line to tutorial, sync'd tutorail and basic.ns

www/tutorial/basic.ns

 # This is a simple ns script. Comments start with #.
 set ns [new Simulator]                  
+source tb_compat.tcl
 
 # define the 4 nodes in the topology. 
 set NodeA [$ns node]

www/tutorial/tutorial.html

@@ -129,6 +129,12 @@ going to node C:
 	<code><pre>
 	tb-set-ip-interface $NodeB $NodeC 192.168.42.42	</code></pre>
 
+<p>
+Then make sure to add the NS run command at the end:
+	<code><pre>
+	# Go!
+        $ns run                               </code></pre>
+
 <p>
 If you would like to try the above example, the completed <a
 href="basic.ns">NS file</a> can be run as an experiment in your