Change in CcnxApp API.  Now callbacks also contain pointer of original
packet (useful to get packet tags, if they exist)

Reflecting changes in PackegTag API

Rescanning bindings

More work on packet-path-weight tracers
diff --git a/.gitignore b/.gitignore
index 78e6787..cbdfd81 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,3 +3,4 @@
 in-progress/
 waf
 *~
+.DS_Store