Re: [manifest] Won't related_application be needed at page load? (#364)

ok, so I was assuming people were using `.onerror`, but they seem to be using a timed redirect:

```JS
//try to go to the app, if it fails, jump to the appstore
setTimeout(function () { window.location = "https://itunes.apple.com/appdir"; }, 25);
window.location = "appname://";
```

See: 
 * [How to check if an app is installed from a web-page on an iPhone?](http://stackoverflow.com/questions/13044805/how-to-check-if-an-app-is-installed-from-a-web-page-on-an-iphone)
 * [How to detect if a URL will open on phone?](http://stackoverflow.com/questions/21199850/how-to-detect-if-a-url-will-open-on-phone)

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https://github.com/w3c/manifest/issues/364#issuecomment-95710388