API endpoints

[jduan00]

Today

/whereis/trackingID
  - Add: demo IDs and api key
  
/status/trackingID
  - Add: demo IDs and api key

Later (see #44)

/operators
  - Ex: fdx: FedEx 

/push
  - require dataVersion
  - /push/standard
  - /push/fdx ??

[jduan00]

Also added health check endpoints (See #165)

/web-health
/app-health