This service accepts a human readable date or unix timestamp and
returns a JSON object with both the human readable date and
unix timestamp. If no correct date or timestamp is supplied
it returns null for the keys.
Provide a date or unix timestamp argument to the API.
e.g. https://timestamp-service-fcc2089.herokuapp.com/jan%201%2016
will yield {unix: 1451606400,natural: "January 1, 2016"}