Update users, keep track of tokens and a bugfix

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Major notes:

• The ability to update users is here. Users can update their own information and admins can update every user's information.
• A mongo collection called tokens will be created that tracks users' tokens. Stay tuned for more abilities such as revoking and blocking tokens.

Minor notes:

• NOAUTH has been clarified to NOUSER when a user is not found.
• Changed NOAUTH_ERROR_POSSIBLE_SPOOF to a non-500 error code since there is no internal server error.

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First commit added minor note 1, clarifying noauth.

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Second commit added minor note 2, fixing 500 error

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All commits added, now I need to fix the token system.