ForwardingStrategy removes PIT if interest wasn't propagated.  Updated
Limits interface (adding config options). Small randomization for decay
frequency in PerFibLimits strategy.
diff --git a/helper/ndn-stack-helper.cc b/helper/ndn-stack-helper.cc
index d84b86b..cfa6f3e 100644
--- a/helper/ndn-stack-helper.cc
+++ b/helper/ndn-stack-helper.cc
@@ -271,7 +271,7 @@
               NS_LOG_INFO ("Max burst: " << m_avgRtt.ToDouble (Time::S) * maxInterestPackets);
 
               // Set max to BDP
-              face->GetLimits ()->SetMaxLimit (m_avgRtt.ToDouble (Time::S) * maxInterestPackets);
+              face->GetLimits ().SetMaxLimit (m_avgRtt.ToDouble (Time::S) * maxInterestPackets);
             }
         }