*   Add userspace DNS caching for the GCS client.
    *   Customize request timeouts for the GCS filesystem.
    *   Improve GCS filesystem caching.
*   Bug Fixes:
    *   Fix bug where partitioned integer variables got their wrong shapes.
        Before
    *   Fix correctness bug in CPU and GPU implementations of Adadelta.
    *   Fix a bug in `import_meta_graph`'s handling of partitioned variables