Serve only one css and one js file

[cbfrance]

Ideally only one CSS and javascript file should be served in production, using either:

1. preprocessing / during processing merging of all CSS in to one file
2. post-processing merging by CDN or some kind of asset manager or cache

For example, currently there are 100 requests on the homepage, hopefully we can get this down to less than half of that by the next major release.