Add NDN Play integration to Mini-NDN code base

Integrate the minindn_play project by Varun Patil into
the base Mini-NDN codebase; this will allow for the
use of the NDN-Play browser UI with minimal additional
dependencies or setup.

Refs #5359

Change-Id: I4fedfa885b07d7fe946a18c6d9b5016d291b3582
diff --git a/requirements.txt b/requirements.txt
index cac5460..df7eb9e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,6 @@
+igraph
 joblib
-python-igraph
+msgpack==1.*
 setuptools
 tqdm
+websockets==15.*