Use S3-direct URLs for image resources.
Since we don't currently have valid SSL certs on Akamai, we need to rely on S3's certs for its own hostnames. Fixes #6.
The JS in it doesn't like newlines, so we need to turn "compression" off. Maybe we can add a smarter compressor later. Maybe it really doesn't matter.
They're stripped out by the Makefile anyway, so those 5 extra bytes per file won't kill anyone.