-Add support for domain-wide delegation by propagating email parameter all the way to JWTConfigFromFile's Subject field.
-Also added support for "refresh_token" output format to output gcloud-style refresh token credentials. This feature has been previously requested by Chris Broadfoot, and can be used to support 3LO authentication in GUAC conforming client libraries.
-Add support for domain-wide delegation by propagating email parameter all the way to JWTConfigFromFile's Subject field. -Also added support for "refresh_token" output format to output gcloud-style refresh token credentials. This feature has been previously requested by Chris Broadfoot, and can be used to support 3LO authentication in GUAC conforming client libraries.