release-0.2.2

Features

AIFlow

1. Add the documents of the AIFlow. #117

Airflow

1. Allow LocalExecutor to run with SQLite. #41
2. Airflow webserver supports the Airflow and Notification databases. #49

Notification Service

1. Introduces the countEvents interface. #11

Bug Fixes

1. Fix oss blob manager download concurrently. #3
2. Deepcopy tasks in celery executor to avoid race condition. #12
3. Fix periodic workflow cannot run. #77
4. Fix HDFSBlobManager failed to download existed file. #87
5. Removes the uncompleted api action_on_dataset_event. #104
6. The workflow directory is set incorrect in AIFlow runtime. #111

Welcome to use this release version and give us the feedback of the AIFlow.