Introducing a couple of real test cases.

Also, basic PIT test shows that everything works as expected...

There was one big change in PIT. Previously, when PIT entry was
satisfied, it was immediately removed. As of recently, PIT entry is
immediately removed.
diff --git a/model/ccnx-fib-impl.cc b/model/ccnx-fib-impl.cc
index e298875..10217e3 100644
--- a/model/ccnx-fib-impl.cc
+++ b/model/ccnx-fib-impl.cc
@@ -200,6 +200,12 @@
     }
 }
 
+uint32_t
+CcnxFibImpl::GetSize () const
+{
+  return super::getPolicy ().size ();
+}
+
 Ptr<const CcnxFibEntry>
 CcnxFibImpl::Begin ()
 {