App does not transpile for IE11

[allthesignals]

For some reason, related to the issue outlined here, EmberJS is not transpiling some of the imported dependencies, including mapbox-gl-js, among others. These deps use things like arrow functions which are not supported in IE11.

Following the linked thread, I am able to get past some of the initial compatibility issues, but there are downstream problems that I can't quite debug:

I can't inspect these error messages, the IE11 debugger just tries to "open" them but nothing happens.

[CeciliaCY]

Having same issue in IE 11. Could you try to detect the browser version while loading the page, if IE 11 is detected, then redirect user to a page with some note to let users know what browser they should use.

[allthesignals]

Thanks @CeciliaCY can you try this deploy branch?

[CeciliaCY]

deploy branch works @allthesignals

[allthesignals]

I think this is the next issue: mapbox/mapbox-gl-js#3422

A new commit in the PR should address most issues, but there are others including wizard not working.

We should run the test suite against IE 11 and debug accordingly.