Implementing base support for TCP-style window-based limiting on per-FIB-prefix and per-face granularity

Currently, limits are supported only by ndn::fw::Limits forwarding
strategy and only at the very basic (not fully tested) level.
diff --git a/model/fw/fw-stats.h b/model/fw/fw-stats.h
index 2b8cae9..1a516d8 100644
--- a/model/fw/fw-stats.h
+++ b/model/fw/fw-stats.h
@@ -94,7 +94,7 @@
                   const Ptr<const Packet> &packet);
 
   virtual void
-  WillErasePendingInterest (Ptr<pit::Entry> pitEntry);
+  WillEraseTimedOutPendingInterest (Ptr<pit::Entry> pitEntry);
 
   // from Object
   void