*   Added `bucket_by_sequence_length`, `sliding_window_batch`, and
        `make_batched_features_dataset`
    *   Remove unmaintained `tf.contrib.ndlstm`. You can find it externally at
        https://github.com/tmbarchive/tfndlstm.
    *   Moved most of `tf.contrib.bayesflow` to its own repo: `tfp`
*   Other:
    *   tf.py_func now reports the full stack trace if an exception occurs.