JS library should be served zipped, not packed

[louisremi]

Dean Edward's packer has a lower compression ratio than minification+gzip, and there's a performance overhead when unpacking a packed script.

It is very easy to serve gzipped script on S3/Cloudfront: minify the script using Google's Closure Compiler, gzip the script, remove the .gz extension, upload to S3 and add "Content-Encoding: gzip" as a cutom header.