External link styling

Mostly from messrs @robertberry and @sndrs 

![screen shot 2014-11-24 at 18 36 21](https://cloud.githubusercontent.com/assets/1147913/5170588/c8ebbd44-7408-11e4-9d10-a5fb8cb3b2f4.png)
Sigh. This is annoying as it makes my tests break, because that list changes depending on environment. For some reason it seems the forked JVM in which tests are run get different config files than the test JVM itself, so you can't just test that all the CORS domains are considered internal links.