Webargs

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Changes:

* ``HTTPExceptions`` raised with `webargs.flaskparser.abort` will always
have the ``data`` attribute, even if no additional keywords arguments
are passed (:pr:`184`). Thanks :user:`lafrech`.

Support:

* Fix examples in examples/ directory.

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Bug fixes:

* Fix behavior of ``AIOHTTPParser.use_args`` when ``as_kwargs=True`` is passed with a ``Schema`` (:issue:`179`). Thanks :user:`Itayazolay`.

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Features:

* ``AIOHTTPParser`` supports class-based views, i.e. ``aiohttp.web.View`` (:issue:`177`). Thanks :user:`daniel98321`.

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Features:

* ``AIOHTTPParser.use_args`` and ``AIOHTTPParser.use_kwargs`` work with `async def` coroutines (:issue:`170`). Thanks :user:`zaro`.

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Support:

* Fix Flask error handling docs in "Framework support" section (:issue:`168`). Thanks :user:`nebularazer`.

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Bug fixes:

* Fix parsing multiple arguments in ``AIOHTTParser`` (:issue:`165`). Thanks :user:`ariddell` for reporting and thanks :user:`zaro` for reporting.