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Covers the API action Logout and discards CSRF token (per #115).
The error code value is 'auth' because it doesn't make much sense to define a code 'logout' that's unlikely ever checked. Instead it would be logical to change the 'login' code into 'auth' as well (possibly also useful for #87 and #89), but that would be an small API-breaking change (similar to #116), so has to be delayed til v1.0.0. Hence the 'auth' entry is added to USAGE.md but the 'login' entry not yet removed.
A logout() example in USAGE.md would be too trivial so I didn't bother.
USAGE.md also includes a user agent fix I missed in #121.