bug 954: Changing the simulation time resolution does not work well with attributes

v.3 Responding to code review comments

https://codereview.appspot.com/6821106/

examples/tutorial/first.cc

@@ -27,6 +27,7 @@ NS_LOG_COMPONENT_DEFINE ("FirstScriptExample");
 int
 main (int argc, char *argv[])
 {
+  Time::SetResolution (Time::NS);
   LogComponentEnable ("UdpEchoClientApplication", LOG_LEVEL_INFO);
   LogComponentEnable ("UdpEchoServerApplication", LOG_LEVEL_INFO);