Add jwt to services

[KyleJune]

Depends on #12

This module should have a built in jwt service for resource servers to use. jwts give resource servers the ability to authenticate a route without having to make a call to the authorization server. It should extend the AbstractAccessTokenService and generate the AccessToken object from the jwt access token.

Add example of resource server and authorization server that use jwt access tokens. The services description should include the inability to revoke jwt access tokens as a disadvantage of using jwts and how short access token lifetime can help reduce the security risk.