Native back button support

[alexmiddeleer]

I would expect the browser's back button to work if my fiddle has links between routes. The back button does update the url, but not the page. Here is an example twiddle: https://ember-twiddle.com/2b5bb04686d04684eb6cd8ef39796165?openFiles=templates.other-page.hbs%2C

Steps to reproduce:

1. click "home" link
2. click "other" link (or a tomster)
3. hit back button
   expected result: taken to home route
   actual result: no effect except url update

@Gaurav0 mentioned I should open this issue in Slack, and noted: "My guess is I'm not doing the necessary cross frame communication via postMessage to make that work"