Bump Spark to version 1.0.2 and make minor modifications to support API

Recreated after squashing commits into one clean one, I hope, for future reference.  Original PR was https://github.com/datastax/spark-cassandra-connector/pull/199, which I closed.

This provides the changes for upgrading Spark to version 1.0.2.

@helena is going to update with a fix for the `Thread.sleep(...)`.

LMK if there are any questions.

-Todd