Guard on at(). Fixes #73
Guard on at(). Fixes #73

Raises NotANumber error if you try to pass a string or anything else to at()

compwron/resque-status,georgemillo/resque-status,georgemillo/resque-status,quirkey/resque-status,compwron/resque-status,nathan-v/resque-state,nathan-v/resque-state,quirkey/resque-status