Ftw.testbrowser

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- Traversal driver: decode gzip encoded responses. [jone]

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- Declare missing dependencies. [lgraf]

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- Log exceptions to stderr when they are not expected. [jone]
- Standardize redirect loop detection: always throw a ``RedirectLoopException``. [jone]
- Add traversal request driver. [jone]

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- Fix `browser.context` when base_url ends with a view name. [phgross]

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- Fix `browser.debug` when body is a bytestring. [jone]

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- Introduce ``browser.expect_unauthorized`` context manager. [jone]