Python 2 fixes

Author: minrk

jupyter_client/jsonutil.py

@@ -1,3 +1,4 @@
+# coding: utf-8
 """Utilities to manipulate JSON objects."""
 
 # Copyright (c) Jupyter Development Team.

jupyter_client/session.py

@@ -47,6 +47,7 @@ def compare_digest(a,b): return a == b
     from datetime import timezone
     utc = timezone.utc
 except ImportError:
+    # Python 2
     from dateutil.tz import tzutc
     utc = tzutc()