CDK-308. Add DatasetOutputFormat.
better log message
CDK-324. Regression in support for POJOs (Avro reflect) in Crunch dataset source.
update release notes
improve code readability
update version numbers in docs
CDK-307. Add DatasetInputFormat.
CDK-354: Add View#deleteAll and FS impl.

This adds View#deleteAll to the public API. AbstractRefinableView
defaults the behavior to reject all deletes. The FS implementation
checks that a view's constraints are aligned with boundaries in the
partition strategy. This guarantees that there are no entities in the
view's covering partitions that do not match the view's constraints.