Improved KafkaConsumer for testing/prototyping.
#368 Add ability to pass a consumer id to embedded kafka
Removed now unnecessary new string - was previously a byte array.
wip-java-api-fix: Changed accidental use of rootMirror to mirror in JavaApiHelper
Merge pull request #365 from datastax/wip-kafka-changes

Improved KafkaConsumer, faster, with ability to pass a consumer id to embedded kafka
Merge pull request #371 from datastax/wip-java-api-fix

wip-java-api-fix: Changed accidental use of rootMirror to mirror in Java...
Stub implementation for UDTs (Cassandra 2.1).
A proper implementation is going to be added later. Currently UDTs will come in and out as java driver core UDTValues which are not Serializable, which means you must map them into something Serializable before sending between Spark nodes or from Spark to the client. Mapping UDTValues to and from case class objects is unsupported as well.

Fixes #374.