*   FFT support added to XLA CPU/GPU.

## Bug Fixes and Other Changes

*   Documentation updates:
    *   Added a second version of Getting Started, which is aimed at ML
        newcomers.
    *   Clarified documentation on `resize_images.align_corners` parameter.
    *   Additional documentation for TPUs.
*   Google Cloud Storage (GCS):
    *   Add client-side throttle.