all: InterestHeader and ContentObjectHeader refactoring to Interest and ContentObject

refs #29
diff --git a/model/fib/ndn-fib-impl.cc b/model/fib/ndn-fib-impl.cc
index 18ee6ac..1e0f04f 100644
--- a/model/fib/ndn-fib-impl.cc
+++ b/model/fib/ndn-fib-impl.cc
@@ -72,7 +72,7 @@
 
 
 Ptr<Entry>
-FibImpl::LongestPrefixMatch (const InterestHeader &interest)
+FibImpl::LongestPrefixMatch (const Interest &interest)
 {
   super::iterator item = super::longest_prefix_match (interest.GetName ());
   // @todo use predicate to search with exclude filters