message: add comments and rename barcodes property
diff: "teamIdentifier": "A93A5CM278",
  "webServiceURL": "https://example.com/passes/",
  "authenticationToken": "vxwxd7J8AlNNFPS8k0a0FfUFtq0ewzFdc",
  + // that should be restored into a Date object
  "relevantDate": "2012-07-22T14:25-08:00",
  "locations": [
  {
  "latitude": 37.6189722
  }
  ],
  - "barcode": {
  + "barcodes": [
  + {
  "message": "SFOJFK JOHN APPLESEED LH451 2012-07-22T14:25-08:00",
  "format": "PKBarcodeFormatPDF417",
  "messageEncoding": "iso-8859-1"
  - },
  + }
  + ],
  "organizationName": "Skyport Airways",
  "description": "Skyport Boarding Pass",
  "logoText": "Skyport Airways",
  