Riprova

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* feat(package): add wheel distribution

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* fix(retrier): remove debug print statement

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* feat(core): use seconds as default time unit (introduces API breaking changes)
* refactor(examples): update examples to use new time unit
* feat(contextmanager): adds context manager support
* feat(examples): add context manager example
* feat: add context managers support

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* refactor(async_retrier): simplify coroutine wrapper
* feat(whitelist): add whitelist and blacklist support
* feat(tests): add missing test cases for whitelist
* feat(retry): pass error_evaluator param
* fix(retrier): cast delay to float
* fix(tests): use valid exception for Python 2.7
* feat(6): add custom error whilelist and custom error evaluator function
* Merge pull request 8 from tsarpaul/master
* refactor(decorator): do not expose retrier instance

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* fix(decorator): wrap retries instance per function call

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* fix(`2`_): handle and forward ``asyncio.CancelledError`` as non-retriable error