Add back pypy install

Change-Id: If59a248071db21b3ae9f03719b12c86011a59a1b

Author: Jon Wayne Parrott

.coveragerc

@@ -4,7 +4,7 @@ include =
     bigtable/*
     bigquery/*
     blog/*
-    cloud_logging/*
+    logging/*
     compute/*
     dns/*
     datastore/*