CDN with Cloudfront

We started using Cloudfront for select resources on https://sandbox.genesys-pgr.org.

Allow for CDN DNS name configuration that is used for

1. Static resources in /html
2. Geo tiles
3. Repository files

There is existing "CDN" code that we use for the tiles in (s1.cdn - s4.cdn.genesys-pgr.org). Some of this code can be reused.