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This PR rebases existing PR #21 on top of the current master, ensuring that all required Travis tests pass. Since that PR has not seen any movement in a year, I though it might be easier to start clean.
I found the original PR useful, as I have also encountered multiple OAI servers that will return 500 errors instead of the 503 that is indicated in the specification. Expanding retry behavior to more 5xx status codes would be extremely useful for fully automated harvests taking place in a distributed process over a large number of diverse server implementations.
And thanks for working on sickle. It's great.