If a token fails to refresh, the user still remains authenticated

[myartsev]

https://github.com/myartsev/ember-simple-auth-jwt/blob/c9f4110ed1ed7a152c264e7123e69fce54026f18/addon/authenticators/jwt.js#L251-L260

Don't know what is the best way to go log out the user from a custom authenticator. Pending on these two SO questions:

• https://stackoverflow.com/questions/46377173/invalidating-logging-out-a-user-from-a-custom-authorizer
• https://stackoverflow.com/questions/46377231/why-must-you-not-access-the-session-service-from-an-authenticator