stefanpenner/ember-cli — pull request #1888 by tstirrat (2014-09-05 18:07:02+00:00)
Title: Allow array of paths to the preprocessCss phase

```js
var app = new EmberApp({
preprocessCss: {
options: {
paths: [ 'main', 'theme/a' ]
}
}
});
module.exports = app.toTree();

// app/styles/main.scss -> dist/assets/main.css
// app/styles/theme/a.scss -> dist/assets/theme/a.css
```

*Ensures backwards compatibility* so that when no paths are configured; `app/styles/app.scss` will still be written to `assets/.css`