MapQuestOpen is discontinued. OpenWeatherMap?

[GeorgiaData]

Added Esri.WorldImagery to replace discontinued MapQuestOpen.Aerial.
Please adjust my inclusion of OpenWeatherMap to provide a sample without the error:
Uncaught Error: No value provided for variable {variant}

[aparshin]

It's better late than never :)

Thank you for replacing MapQuestOpen.Aerial!

But I don't think that OpenWeatherMap is a good improvement for this example: the error can be fixed by replacing OpenWeatherMap with OpenWeatherMap.Clouds, but then I have two more problems:

1. The OWM servers return 401 Unauthorized code. And I don't know what to do with that.
2. OWM layer is an overlay - it should be shown above other layers. I don't want to complicate an example by adding basemaps and overlays - I would prefer to keep a simple list of basemaps.

So I suggest removing OWM from this example. I would do this change as a separate commit because I don't have access to your repository. Is it OK to you?