• Add MD5 hash check for Download with stream, requests only (storage/demo: add demo script parser #32)
• Add MD5 hash check for Download with stream, generic transport (i.e in _download.py)
• Add MD5 hash check for Download without stream
• Add MD5 hash check for ChunkedDownload
• Add CRC32C hash check for Download (necessary for composite objects, though will be very slow unless crcmod is used with C speedups) (gcloud.datastore.key.Key.parent untested, undocumented, useless #135, includes warning for slow crcmod)
• Add Upload hash checks (gcloud.storage.bucket.Bucket.save_default_object_acl with empty ACL doesn't clear #139)

/cc @jonparrott