Aiohttp-json-api

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* Python 3.5 compatibility changes

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* Handle aiohttp-json-api exceptions and errors in middleware. If exceptions is not related to JSON API errors, then exception is reraised
* Huge refactoring of RequestContext
* No more use of boltons cachedproperties, instead use parsing static methods related to each request context' entity
* Update docs for RequestContext methods
* Add typings to RequestContext

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* Properly handle error with wrong relation name (raise HTTP 400)

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* Fix bdist_wheel python tag to support Python 3.5

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* Python 3.5 support (avoid usage of Python 3.6 format strings)
* Registry is plain object now
* Custom Registry support (`registry_class` parameter in ``aiohttp_json_api.setup_jsonapi`` method)
* Log debugging information at start about registered resources, methods and routes
* Use OrderedDict inside SchemaMeta

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* Fix bug with JSONPointer when part passed via __truediv__ is integer
* Validate relationship object before adding relationship in ToMany field