Bucket limit 79974552

This is work heading in the direction of a single S3 bucket in order to allay the issue of running out of buckets. 
With this setup, we would never run out of buckets and never have to configure anything differently.

From an SEO perspective any ```cdn.locationdomain.com``` can be pointed to the single bucket and assets are referenced with asset keys prefixed with ```client_urn/location_urn```

This would take a migration script to move all the existing assets in the existing s3 buckets into the new bucket