* Development and testing moved to Python 3.4.0.
* Flattened package namespace to remove simple package prefix.
* Engine celery config specifies 2 queues - engine and engine-aggregator.
* Engine task execute_join_gateway uses engine-aggregator with a single worker.
* Event queue now requires timestamp parameter for proper async ordering.
* Migrated several unittest assertEquals to assertEqual.
* Fixed engine exception handler in task execute_task.