Atilla

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* Fix vnd_error_response returning a `Response` with wrong `Response.headers` type (youtux)
* Require flask version < 0.11, otherwise atilla won't work.
* Make a test pass also with the latest halogen version

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* accept remote address as host name if not passed by config (bubenkoff)

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* handle unauthorized requests correctly (bubenkoff)

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* correctly handle exception message (bubenkoff)

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* python3 support fixes (bubenkoff)

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* Initial public release (bubenkoff)
* Use flask-cache for request rate logging (bubenkoff)
* Add well-defined configuration defaults (bubenkoff)
* Code readability improvements (bubenkoff)
* Better test coverage (bubenkoff)