Add missing @since tags and javadoc to new public members.
CDK-177. Marker.ImmutableMarker should not be exposed as a public class.
CDK-177. Change Flume Log4jAppender to use Marker instead of PartitionKey.
CDK-177. Add convenience for exposing a View as a Crunch ReadableSource.

Also remove use of deprecated PartitionKey.
CDK-177. Deprecate PartitionKey.