wish list item: package refactoring

[ppine7]

the main package used in the public kafka-es-indexer project is: "org.elasticsearch.kafka.indexer"

Changes I'd like to make:

1. for all Kafka batch consumer related classes - use "org.kafka.batch.consumer" package
2. for generic batch processing classes - use "org.kafka.batch.processor" package
3. for ES-specific batch processor (indexer) - use "org.kafka.batch.processor.es" package
4. for the example implementation of the ES batch processor - use "org.kafka.batch.processor.es.example" package
5. rename "kafka-es-indexer" project to "kafka-batch-processor"
6. rename all related property files/ Spring configs

This involves refactoring of the following:
– kafka-es-indexer project
– package/target build for Travis/JFrog (???)