Load third-party assets over correct HTTP protocol

Previously, the third-party assets used on the site were only included over unsecured HTTP, which will cause warnings to be raised once all site traffic passes through SSL. The third-party assets have been updated to use the correct protocol depending on the state of the site.

https://trello.com/c/Qnlf8zSN

![](http://www.reactiongifs.com/r/runf.gif)