v4.0.2 (2014-07-19)

UpdateResources
New resources to get, add or remove emails and smsesPOST /notifications/:slug/:tracking_number/add
POST /notifications/:slug/:tracking_number/add
PUT /notifications/:slug/:tracking_number/remove
New function to reactivate and retrack expired tracking oncePOST /trackings/:slug/:tracking_number/retrack