Fix mixed content warnings on loading Google Fonts

There are mixed content warnings in Chrome:

![fda-mixed-content](https://cloud.githubusercontent.com/assets/4592/3259899/5dbacc6e-f248-11e3-86bc-19c78cf977e6.png)
![mixed-content-2](https://cloud.githubusercontent.com/assets/4592/3259901/5eeb2e6c-f248-11e3-8dcb-896764e4d5d2.png)

Both from Google Fonts. This fixes those.