fw+doc: Renaming and extending limit extenstion

SimpleLimits now called PerOutFaceLimits.  Also, there is now
PerFibLimits that is inherited from PerOutFaceLimits and implements
additional check.

Also, this commit includes a couple of tricks to improve documentation
of templated classes (PerOutFaceLimits and PerFibLimits). Not ideal, but
much better than before.
diff --git a/model/fw/flooding.cc b/model/fw/flooding.cc
index 6d021ec..b4e94a8 100644
--- a/model/fw/flooding.cc
+++ b/model/fw/flooding.cc
@@ -36,14 +36,20 @@
 #include <boost/lambda/bind.hpp>
 namespace ll = boost::lambda;
 
-NS_LOG_COMPONENT_DEFINE ("ndn.fw.Flooding");
-
 namespace ns3 {
 namespace ndn {
 namespace fw {
 
 NS_OBJECT_ENSURE_REGISTERED (Flooding);
-    
+
+LogComponent Flooding::g_log = LogComponent (Flooding::GetLogName ().c_str ());
+
+std::string
+Flooding::GetLogName ()
+{
+  return super::GetLogName ()+".Flooding";
+}
+
 TypeId Flooding::GetTypeId ()
 {
   static TypeId tid = TypeId ("ns3::ndn::fw::Flooding")