Adding RIT, PIT, FIB, and CS to ccnx-l3-protocol.  Some small
rearrangements in the code
diff --git a/helper/ccnx-header-helper.h b/helper/ccnx-header-helper.h
index 0cfbd12..996b874 100644
--- a/helper/ccnx-header-helper.h
+++ b/helper/ccnx-header-helper.h
@@ -50,6 +50,7 @@
 class CcnxHeaderHelper
 {
 public:
+  enum Type {INTEREST, CONTENT_OBJECT};
 
   /**
    * Static function to create an appropriate CCNx header
@@ -72,7 +73,7 @@
    * \see http://www.ccnx.org/releases/latest/doc/technical/BinaryEncoding.html
    */
   
-  static Ptr<Header>
+  static Type
   CreateCorrectCcnxHeader (Ptr<const Packet> packet);
 };