Flask-hookserver

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- Proper Python 2.7 support
- Respect GitHub rate limit of 60 requests per hour
- Make key param to HookServer optional
- Add optional param url
- Use VALIDATE_IP and VALIDATE_SIGNATURE instead of DEBUG
- Simplify some error messages
- Add test suite

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- Support IPv4 addresses mapped to IPv6

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- Fix Python 2 bug in IP address decoding

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- Ignore HMAC in debug mode

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- Reload GitHub IP block on each request

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- Initial release