Aiohttp-json-api

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* Base Registry class from UserDict, so Registry is a dict with ensure_identifier method.
* More strict typing checks on setup.

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* Fix bug with mutation not cloned resource in method for delete relationship
* Require JSON API content type on delete relationships

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* Method for update return original and updated resource as result. Updated resource is created via deepcopy. It will be useful to determine returned HTTP status
* Fix bug with enumeration (choices) in String field
* Fix bug with context event setup for OPTIONS, HEAD and another request methods not used in JSON API

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* Mass refactoring of schema, fields, validation and decorators
* Generic approach to setup Schema decorators is used (inspired by Marshmallow)
* Fields are used only for encode/decode now (with pre/post validation). Additional validators for fields must be created on schema level
* Custom JSON encoder with support JSONPointer serialization
* Remove boltons from requirements
* No more remap input data dictionary with key names to underscores conversion.
* Add helpers "first" and "make_sentinel" (cherry-picked from boltons)
* Fix enumeration (choices) support in String field

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* Setup content-type validation on mutation API methods (application/vnd.api+json is required)
* Properly get and encode relationships fields
* Update docs and typing for ensure_identifier Registry's method

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* Fix bugs related to Python 3.5
* Generation of documentation on RTD is fixed