Aiohttp-apiset

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* fix zero for number parameter
* transfer validation errors into client handler if specified argument errors

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* Added class OperationIdMapping and param operationId_mapping in SwaggerRouter.include
for load authentic specification with specify operationId (2)
* Fixed validation form with file
* Fixed overriding basePath
* Added jinja2 decorator for working with aiohttp_jinja2
* Loading operation body from docstring
* Blank string param for number and integer treated as a missed

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* Fixed verbosity errors
* Set default value from swagger operationObject
* Started docs on http://aiohttp-apiset.readthedocs.io
* Swagger-ui index on `basePath`/apidoc/

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* Added verbosity errors validate with jsonschema

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* Added compatibility with aiohttp >= 1.1
* Added safe decode form and json
* Fixed extract body

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* Fixed convertation from match_info