Saturn 2.0.0

New features:

1. #2 Support Multiple Zookeeper Cluster
2. #31 Add API to query jobs information

Improvements:

1. #25 Gracefully shutdown
2. #24 Console logback output file should be configurable
3. #17 Support quick start by docker containers
4. #9 Use Webjars to reduce the js/css library code in console

Release Artifacts:

Executor Zip File
Console Zip file