Add a PubSub event parser and serialiser.

src/pubsub/mod.rs

@@ -0,0 +1,9 @@
+// Copyright (c) 2017 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+pub mod event;
+
+pub use self::event::PubSubEvent;