Dataset Grouper 0.3.0

What's Changed

• Add serialization and beam modules to the API.
• Simplify github organization, so that all python modules are in dataset_grouper/.
• Update script to build and publish package.
• Added utilities for creating test datasets.
• Added more examples, including a Dirichlet partitioning example.
• Removed preprocess_fn arg from PartitionedDataset.build_group_stream. Preprocessing should now be applied via tf.data.Dataset.map.

Full Changelog: v0.2.1...v0.3.0