dfe96023841d9f235f31c95295911d6812f443bb

The sidebar arrows should change content when they're open. There's a small bug in css/customstyles.css that prevents this; other parts of the style use 'active' instead of 'open' so it needs to here too. This PR fixes it. Since Font Awesome is already wired in, I think that their carets look nicer. Here's how: ``` .nav li > a > span:after { font-family: FontAwesome; content: "\f105"; } .nav li.active > a > span:after { font-family: FontAwesome; content: "\f107"; } ```
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