Registered claims are [Here](http://tools.ietf.org/html/draft-ietf-oauth-json-web-token-21#section-4.1) Might want to change to the short versions? ``` auth.iss('the issuer') auth.nbf() # Not Before - default to now? ``` Or use the long names in the spec? `.nbf(...)` vs `.not_before(...)` - `not_before` is clearer I guess.
