- Add Twitter provider for thirdparty login
- Add `Cache-Control` header for jwks endpoint `/jwt/jwks.json`
- Add `validity_in_secs` to the return value of overridable `get_jwks` recipe function.
- This can be used to control the `Cache-Control` header mentioned above.
- It defaults to `60` or the value set in the cache-control header returned by the core
- This is optional (so you are not required to update your overrides). Returning `None` means that the header won't be set