Grappa-http

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* fix(adapters): use issubclass for adapter valid interface.

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* feat(api): add use_adapter() API for custom adapter registering
* feat(jsonschema): update example which uses satisfy attribute operator

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* feat(requirements): upgrade grappa to latest version
* feat(operators): add output size limit
* feat(docs): add thanks badge
* refactor(docs): update description
* feat(examples): add featured example
* fix(package): read version from grappa_http package
* fix(docs): use grappa_http package

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* First version (beta)