Integration of a map "component"

[mpizenberg]

Sometimes we want to reuse web "components" like maps and embed them inside an Elm application. There are two main ways of doing so:

1. Calling the component API through ports, like we started to explore last meetup: https://ellie-app.com/5pjqq5Nwva1/1
2. Wrapping the component in a "custom element". See Luke Westby (Ellie author) notes about that: https://paper.dropbox.com/doc/Custom-Elements-in-Elm-1Dd7LMDwgJLNGHazDImSm