Kafka 0.8 Support for SummingBird

Don't merge yet. Work in progress

- [x] Create Kafka 08 module
- [x] Test SummingBird with Kafka 08 spout
You can use "org.apache.storm"  % "storm-kafka" % "0.9.2-incubating" instead of storm-kafka-0.8-plus. storm-kafka-plus was merged back into storm-kafka and is no longer being maintained.