model: First set of major API changes and reorganizations

Main motive: change interface in Face class, resulting in need to change forwarding strategy interfaces

Refs #1005 (http://redmine.named-data.net/)
diff --git a/wscript b/wscript
index 8dbff90..da9044c 100644
--- a/wscript
+++ b/wscript
@@ -183,7 +183,7 @@
 
     bld.recurse ('tools')
 
-    bld.ns3_python_bindings()
+    # bld.ns3_python_bindings()
 
 
 @TaskGen.feature('ns3fullmoduleheaders')