Oraclize or make ownable function to alter authenticator public key

[nanaknihal]

The web2 server may change its public key and often has a jwks endpoint so people can access the pubkey any time. e.g. https://www.facebook.com/.well-known/oauth/openid/jwks/ or https://orcid.org/oauth/jwks

[nanaknihal]

Users may waste money if this doesn't happen rapidly enough, unless:
add 'kid' string to each smart contract. The frontend calls kid(), checking that it matches the kid of the JWT. If not, the frontend issues a warning saying that the user should not submit and prevents submission to the smart contract with a stale key.

Also add a function to change e, n, and sandwich

[nanaknihal]

Users may waste money if this doesn't happen rapidly enough, unless: add 'kid' string to each smart contract. The frontend calls kid(), checking that it matches the kid of the JWT. If not, the frontend issues a warning saying that the user should not submit and prevents submission to the smart contract with a stale key.

Also add a function to change e, n, and sandwich

Relevant: #13