Ember: show how to use it w/ the ArcGIS API for JavaScript

[tomwayson]

I suspect most apps that use this will want to also use the ArcGIS API for JavaScript. In Ember, you need either one of these addons:

ember-cli-amd
ember-esri-loader

The problem is that both of those will find and replace any calls to require() define() in the code at build time, and if you are using either ember-cli-stencil or the method shown in this example to load the JS, you will get errors when stencil tries to call customElements.define(). ember-esri-loader@4.00+ is designed to avoid those errors, but they will still show up in production builds. There's a workaround for that. A similar hack may work for emebr-cli-amd.

I think it would be good to at the very least document ^^^ in the README.

We could take it a step further and add ember-esri-loader to this repo and try and work through the trouble I was having trying to keep customElements from getting mangled in production builds and see if we can come up w/ a less hackish work around.

[ffaubry]

The recent PR #6 has addressed the issue of using calcite components with ember-cli-amd.
See https://github.com/ArcGIS/calcite-components-examples/tree/master/ember#using-with-jsapi

The instructions have not been updated for how to use ember-esri-loader.