Partially support federated login

Two things:
1. I've never attempted to support this before.
2. It seems surprisingly and perhaps deceptively simpler than what I
   expected. I'm unsure what to do once Google's API authenticates the user. I
   currently look-up the user's role, trips, etc. using their email address. The
   role is stored in the Accounts table alongside username, email, password. I
   will speak with the interviewer tomorrow about this.

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