Add MockForwarder

Allows NDN applications to test interest/data exchanges as if an NFD was present... but with no network IO
diff --git a/src/test/java/com/intel/jndn/mock/MockFaceTest.java b/src/test/java/com/intel/jndn/mock/MockFaceTest.java
index 7c8bbc9..37b0bca 100644
--- a/src/test/java/com/intel/jndn/mock/MockFaceTest.java
+++ b/src/test/java/com/intel/jndn/mock/MockFaceTest.java
@@ -181,7 +181,7 @@
     }
     final State state = new State();
 
-    // connect transport
+    // connect callback
     face.registerPrefix(new Name("/fake/prefix"), (OnInterestCallback) null, new OnRegisterFailed() {
       @Override
       public void onRegisterFailed(final Name prefix) {