Fix Win32 compilation error

Without this change, we see the following error trace on a fresh checkout of http://github.com/g0v/ivod.ly.g0v.tw/ on Windows 8, Node 0.10 with `npm i; npm start`.

```
> ly.g0v.tw@0.1.1 start C:\Users\Audrey\Documents\GitHub\ivod.ly.g0v.tw
> brunch watch --server


TypeError: Object app/app/controllers.ls has no method 'map'
    at C:\Users\Audrey\Documents\GitHub\ivod.ly.g0v.tw\node_modules\brunch\lib\helpers.js:90:60
    at Array.forEach (native)
    at C:\Users\Audrey\Documents\GitHub\ivod.ly.g0v.tw\node_modules\brunch\lib\helpers.js:88:26
    at Array.forEach (native)
    at exports.replaceSlashes.replaceSlashes (C:\Users\Audrey\Documents\GitHub\ivod.ly.g0v.tw\node_modules\brunch\lib\he
lpers.js:83:24)
```

Reported by @OtomeSound in http://logbot.g0v.tw/channel/g0v.tw/2013-11-06/334