yyx990803/vue — pull request #120 by bpierre (2014-02-21 12:37:30+00:00)
Title: Make utils.extend() returns the extended object

It would allow to do this:

```js
function foo (options) {
options = utils.extend({
a: 1 // default option
}, options)
}
```

Instead of this:

```js
function foo (optionsExt) {
var options = {
a: 1 // default option
}
utils.extend(options, optionsExt)
}
```