dependency logstash-core-plugin-api >= 1.60 <= 2.99

fix shutdown sequence bug with a rogue shutdown event, and bump version

Bump version to 5.0.0

Delete ubused spec

Merge branch 'update/0.9' into plugin-api-v1

* update/0.9:
  Bump version to 4.0.0 to add LS 5.0 support
  Expose SSL options for 0.9 consumer Ref: http://kafka.apache.org/documentation.html#security_ssl
  Add new Kafka 0.9 consumer
  update to 0.9 consumer

Make sure all the gems were published under jruby

version 3.0.0

Fix Log4j warnings by setting up the logger

Add plugin api dependency

Fix up vendoring in jar dependency