Prepare Release 2.0.7
Prepare Release 2.0.7

    * Adds Timestamp, Improve Conversion Perf (SPARKC-522)
    * Allow setting spark.cassandra.concurrent.reads (SPARKC-520)
    * Allow splitCount to be set for Dataframes (SPARKC-527)

datastax/spark-cassandra-connector,datastax/spark-cassandra-connector