Use secure CDN for default image path

[adamcoulombe]

the default image path is currently pointing to Gary Little's website.
This should be changed to an actual CDN on https

[garylittleRLP]

Looks like a good idea. I'm unfamiliar with CDN, is that URL going to stick around forever?

[adamcoulombe]

This was the solution a number of folks were using for the js-marker-clusterer repo: googlearchive/js-marker-clusterer#55 (comment)

I'm not familiar with how the two repos evolved, but that repo actually uses a relative url which could also be a good solution. In either case I think the personal website needs to be replaced.

[stephenmcd]

Thanks guys