Webargs

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Features:

* Add ``view_args`` request location to ``FlaskParser`` (:issue:`82`). Thanks :user:`oreza` for the suggestion.

Bug fixes:

* Use the value of ``load_from`` as the key for error messages when it is provided (:issue:`83`). Thanks :user:`immerrr` for the catch and patch.

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Bug fixes:

* aiohttpparser: Fix bug that raised a ``JSONDecodeError`` raised when parsing non-JSON requests using default ``locations`` (:issue:`80`). Thanks :user:`leonidumanskiy` for reporting.
* Fix parsing JSON requests that have a vendor media type, e.g. ``application/vnd.api+json``.

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Features:

* ``Parser.parse``, ``Parser.use_args`` and ``Parser.use_kwargs`` can take a Schema factory as the first argument (:issue:`73`). Thanks :user:`DamianHeard` for the suggestion and the PR.

Support:

* Docs: Add "Custom Parsers" section with example of parsing nested querystring arguments (:issue:`74`). Thanks :user:`dwieeb`.
* Docs: Add "Advanced Usage" page.

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Features:

* Add ``AIOHTTPParser`` (:issue:`71`).
* Add ``webargs.async`` module with ``AsyncParser``.

Bug fixes:

* If an empty list is passed to a List argument, it will be parsed as an empty list rather than being excluded from the parsed arguments dict (:issue:`70`). Thanks :user:`mTatcher` for catching this.

Other changes:

* *Backwards-incompatible*: When decorating resource methods with ``FalconParser.use_args``, the parsed arguments dictionary will be positioned **after** the request and response arguments.
* *Backwards-incompatible*: When decorating views with ``DjangoParser.use_args``, the parsed arguments dictionary will be positioned **after** the request argument.
* *Backwards-incompatible*: ``Parser.get_request_from_view_args`` gets passed a view function as its first argument.
* *Backwards-incompatible*: Remove logging from default error handlers.

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Features:

* Add ``FalconParser`` (:issue:`63`).
* Add ``fields.DelimitedList`` (:issue:`66`). Thanks :user:`jmcarp`.
* ``TornadoParser`` will parse json with ``simplejson`` if it is installed.
* ``BottleParser`` caches parsed json per-request for improved performance.

No breaking changes. Yay!

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Features:

* ``TornadoParser`` returns unicode strings rather than bytestrings (:issue:`41`). Thanks :user:`thomasboyt` for the suggestion.
* Add ``Parser.get_default_request`` and ``Parser.get_request_from_view_args`` hooks to simplify ``Parser`` implementations.
* *Backwards-compatible*: ``webargs.core.get_value`` takes a ``Field`` as its last argument. Note: this is technically a breaking change, but this won't affect most users since ``get_value`` is only used internally by ``Parser`` classes.

Support:

* Add ``examples/annotations_example.py`` (demonstrates using Python 3 function annotations to define request arguments).
* Fix examples. Thanks :user:`hyunchel` for catching an error in the Flask error handling docs.


Bug fixes:

* Correctly pass ``validate`` and ``force_all`` params to ``PyramidParser.use_args``.