newcomers.
    *   Clarified documentation on `resize_images.align_corners` parameter.
    *   Additional documentation for TPUs.
*   Google Cloud Storage (GCS):
    *   Add client-side throttle.
    *   Add a `FlushCaches()` method to the FileSystem interface, with an
        implementation for GcsFileSystem.
*   Other:
    *   Add `tf.contrib.distributions.Kumaraswamy`.

	scannerCycle                         = uatomic.NewDuration(dataScannerStartDelay)
	scannerIdleMode                      = uatomic.NewInt32(0) // default is throttled when idle
	scannerExcessObjectVersions          = uatomic.NewInt64(100)
	scannerExcessObjectVersionsTotalSize = uatomic.NewInt64(1024 * 1024 * 1024 * 1024) // 1 TB
	scannerExcessFolders                 = uatomic.NewInt64(50000)