TransLink REST API support

[jbriones1]

Summary:
Requests to TransLink need to go through our web server since there's a 1,000 request limit per day for an API key. While testing we can use our own personal keys. We'll scope this for only the upper bus loop for now, since it's a terminal station.

Features:

• Ability to make requests the Real-Time GTFS TransLink API
• Expose endpoints to our frontend application for the time the next buses show up
• (Maybe) Return delays or events for buses in the same request
• Unit tests

Resources:
https://www.translink.ca/about-us/doing-business-with-translink/app-developer-resources