Please add Cloudfront as CDN

[pmeenan]

All fixed: http://www.webpagetest.org/result/100912...25e3a5329/

Thanks for pointing that out. Looks like I broke the calculation when we did the Page Speed release (completely unrelated change though). Luckily I also included an update mechanism in that release so I can now blast updates to all of the test machines without having to coordinate a rollout :-)