topology-reader: Adding support for adding and configuring ErrorModel on each link

Thanks to Saran Tarnoi for the initial implemenation
diff --git a/examples/wscript b/examples/wscript
index c7868f5..695e17c 100644
--- a/examples/wscript
+++ b/examples/wscript
@@ -24,6 +24,9 @@
         obj = bld.create_ns3_program('ndn-grid-topo-plugin', ['ndnSIM'])
         obj.source = 'ndn-grid-topo-plugin.cc'
 
+        obj = bld.create_ns3_program('ndn-grid-topo-plugin-loss', ['ndnSIM'])
+        obj.source = 'ndn-grid-topo-plugin-loss.cc'
+
         obj = bld.create_ns3_program('ndn-congestion-topo-plugin', ['ndnSIM'])
         obj.source = 'ndn-congestion-topo-plugin.cc'