Support for updating counter columns. Fixes #27.
further fix #47: https://github.com/datastax/spark-cassandra-connector/issues/47
Compose two patches for #47. Now describe_ring fallback should work in both cases: pre-2.0.4 cassandra server and/or pre-2.0.4 cassandra-thrift.
Merge pull request #59 from datastax/issue-27

Support for updating counter columns. Fixes #27.
Merge branch 'master' of https://github.com/datastax/cassandra-driver-spark into issue-45