* Pod -> ReplicationController, which also forced me to hack around
hostname issue on the master. (Spark master sees the incoming slave
request to spark-master and assumes it's not meant for it, since it's
name is spark-master-controller-abcdef.)

* Remove service env dependencies (depend on DNS instead).

* JSON -> YAML.

* Add GCS connector.

* Make example do something actually useful: A familiar example to
anyone at Google, implement wordcount of all of Shakespeare's works.

* Fix a minor service connection issue in the gluster example.