Support JSONAPI standart

[ghost]

Related to #208

Documentation: https://fs-rails-base-api-pr-216.herokuapp.com/docs

Notable changes:

• JSONAPI::Utils gem was added
• JSONAPI::Resource now replacing Serializers
• Updated routing with JSONAPI support
• Custom extensions for JSONAPI was added
• Provided signout endpoint
• Users CRUD endpoints
• TodoItems CRUD endpoints
• Application and users policy

Progress list:

• Add JSONAPI::Utils gem
• Replace routes
• Replace serializers with resources
• Add custom failure app for Devise
• Add custom Devise auth strategy
• Support JSON API with responders
• Add content-type and required fields to docs
• Create required test helpers
• Fix tests
• Add signout endpoint
• Add users CRUD endpoints
• Add more seeds
• Add TodoItem CRUD endpoints
• Update docs
• Deploy fork to Heroku
• Update Readme

[dmitrytrager]

@AlexeyKuznetzov time has come
let's update with master

[dmitrytrager]

@AlexeyKuznetzov deploy app should be ready, have fun

[timurvafin]

Could we use https://github.com/fs/rails-api-format to store custom responder, warden failure app, warden strategy?

[ghost]

@timurvafin Yes, we can move all the lib stuff to gem. However, the whole rails-api-format gem should be rewritten for this purpose.

[IlkhamGaysin]

Would it be good to add this /lib/jsonapi to autoload path in application.rb?

[ghost]

Well, maybe.

[ghost]

Done @IlkhamGaysin