ccnx: Added verifier and a few small changes

Change-Id: Idbdc0597bd9afb3cfa7c7bbc05175ca8aa1c6b1b
diff --git a/ccnx/ccnx-key.h b/ccnx/ccnx-key.h
index 695afda..3d14afc 100644
--- a/ccnx/ccnx-key.h
+++ b/ccnx/ccnx-key.h
@@ -36,7 +36,7 @@
   enum VALIDITY
   {
     NOT_YET_VALID,
-    VALID,
+    WITHIN_VALID_TIME_SPAN,
     EXPIRED,
     OTHER
   };