Use local version of optimizely javascript

Change from a cdn version to a local version to investigate performance benefit of not having an extra ssl negotiation. This should save 500ms of blocking time.

We'll compare with http://www.webpagetest.org/result/140506_WA_d6373e403a883b75971058d2125f216a/

This is only temporary. If the performance improvement is worthwhile we'll need to come up with a mechanism of polling the optimizely server to grab the latest version when it updates.

@andrewgarner @jakubpawlowicz