Spark: Update to current example standards, add GCS connector

* 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.

examples/examples_test.go

@@ -344,10 +344,11 @@ func TestExampleObjectSchemas(t *testing.T) {
 			"secret":     &api.Secret{},
 		},
 		"../examples/spark": {
+			"spark-driver-controller": &api.ReplicationController{},
+			"spark-master-controller": &api.ReplicationController{},
 			"spark-master-service":    &api.Service{},
-			"spark-master":            &api.Pod{},
+			"spark-webui":             &api.Service{},
 			"spark-worker-controller": &api.ReplicationController{},
-			"spark-driver":            &api.Pod{},
 		},
 		"../examples/spark/spark-gluster": {
 			"spark-master-service":    &api.Service{},