Boto-rsync

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* Refactored the callback to be more accurate (hopefully).
* Added estimated time remaining / transfer duration to callback.
* Fixed a bug where SIGINT might not exit properly.

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* Added an ASCII spinner to help the user understand that the process hasn't
hung.
* Fixed bugs from the `--ignore_empty` and directory features that were added in
v0.2.
* Fixed a bug where the beginning of file/key names were sometimes stripped.
* Fixed a bug where directory downloads sometimes crashed.

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* Added the `--ignore_empty` option.
* Always assume that a key name ending in "/" is an S3 "directory."

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* Initial release.