progrium/ruby-jwt — pull request #48 by jamesberlage (2014-11-17 17:57:37+00:00)
Title: Adds check for invalid exp claim

This should partially address #38. This ensures that the exp claim is an IntDate, as required [here](http://tools.ietf.org/html/draft-ietf-oauth-json-web-token-20#section-4.1.4). It will raise an informative error if the claim is invalid.