Merge pull request #56 from metacret/master

A few fixes before releasing 0.2.2
[Gradle Release Plugin] - pre tag commit:  '0.2.2'.
[Gradle Release Plugin] - new version commit:  '0.2.3-SNAPSHOT'.
[Gradle Release Plugin] - pre tag commit:  '0.2.3'.
[Gradle Release Plugin] - new version commit:  '0.2.4-SNAPSHOT'.
ThreadPool for Kafka Producer

- kafka_2.9.2-0.8.1.1 upgraded
- threadpool created for kafka producing
Merge pull request #59 from metacret/ISSUE-57

ThreadPool for Kafka Producer