Repoze-retry

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- Don't write a temporary file unless the request content length is
greater than 2MB (use a StringIO instead).

- Make ZPublisher.Publish:Retry exceptions retryable (via a soft dependency).
This makes repoze.retry work the same as the Zope 2 publisher when that
module is installed.

- 100% test coverage.

- Change documentation to show proper retryable exception syntax in
paste config.

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- Close the app_iter at appropriate points to silence lint errors.

- Return a Bad Request error if we get a socket error while reading
input.

- Fix traceback output to wsgi.errors (it was going to console).

- Assert that downstream app must call start_response before successfully
returning.

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- Seek wsgi.input back to zero before retrying a request due to a
conflict error.

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- Fixed concurrency bug whereby a response from one request might be
returned as result of a different request.

- Initial PyPI release.

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- Added WSGI conformance testing for the middleware.

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- Made the retryable exception(s) configurable, removing the hardwired
dependency on ZODB3.