Shopify/active_shipping — pull request #44 by Capncavedan (2012-05-22 03:27:58+00:00)
Title: Add USPS tracking capabilities

Accessed in same manner as UPS and FedEx tracking:

```
usps = USPS.new(:login => 'USPSlogin')
tracking_info = usps.find_tracking_info('9102901000462189604217')

tracking_info.shipment_events.each do |event|
puts "#{event.name} at #{event.location.city}, #{event.location.state} on #{event.time}. #{event.message}"
end
```