++++++++++++++++++
- Added ``Item.s3_is_overloaded()`` method for S3 status check. This method is now used on
retries in the upload method now as well. This will avoid uploading any data if a 503
is expected. If a 503 is still returned, retries are attempted.
- Added ``--status-check`` option to ``ia upload`` for S3 status check.
- Added ``--source`` parameter to ``ia list`` for returning files matching IA source (i.e.
original, derivative, metadata, etc.).
- Added support to ``ia upload`` for setting remote-name if only a single file is being
uploaded.
- Derive tasks are now only queued after the last file has been uploaded.
- File URLs are now quoted in ``File`` objects, for downloading files with special
characters in their filenames