Merge pull request #760 from silasdavis/develop

Flush events after hashing to fix timing issue in test

execution/execution.go

@@ -147,7 +147,7 @@ func (exe *executor) Commit() (hash []byte, err error) {
 		return nil, err
 	}
 	// flush events to listeners
-	exe.eventCache.Flush()
+	defer exe.eventCache.Flush()
 	return exe.state.Hash(), nil
 }