Internetarchive

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- Added support for retry on S3 503 SlowDown errors.

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- Added support for \n and \r characters in upload headers.
- Added support for reading filenames from stdin when using the ``ia delete`` command.

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- The delete ``ia`` subcommand is now verbose by default.
- Added glob support to the delete ``ia`` subcommand (i.e. ``ia delete --glob='*jpg'``).
- Changed indexed metadata elements to clobber values instead of insert.
- AWS_ACCESS_KEY_ID and AWS_SECRET_ACCESS_KEY are now deprecated.
IAS3_ACCESS_KEY and IAS3_SECRET_KEY must be used if setting IAS3
keys via environment variables.