Simples3

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* Made simples3 a "flat package", imports work as usual.
* Refactored ``url_for`` to ``make_url_authed``, ``make_url``.
* Added an optional timeout argument to the ``S3Bucket`` class.
* Added nose-based testing.
* Added support for streaming with ``poster.streaminghttp``.
* Added support for Google App Engine.

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* Add S3-to-S3 copy method.

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* Minor fixes, released as 0.4 mostly because the previous version naming
scheme was a bad idea.
* 0.4.1: Made the put method retry on HTTP 500.
* 0.4.1: Fix a critical error in signature generation when metadata is given.

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* Add a ``url_for`` method on buckets which lets you use expiring URLs. Thanks
to Pavel Repin.
* Much better test coverage.
* ``simples3`` now works on Python 2.6's ``mimetypes`` module.
* r1: Handle HTTP errors in exception parser better, which broke the existence
test.