jkeen/tracking_number — pull request #12 by firien (2014-03-24 20:02:38+00:00)
Title: Fedex fix

had a fedex tracking number today where the mod 11 returned 10 and it didn't recognize it as a valid number

http://answers.google.com/answers/threadview/id/207899.html

search bing or google for "974367662710" and it will return a fedex link. Prior to this patch `tracking_number` would return `TrackingNumber::Unknown`