Error: bindAll must be passed function names

Immediately ran into this issue when calling new Backbone.Rpc(). I'm using underscore.js v1.5.2, which throws an exception with the following code (found in Backbone.Rpc).

```
// fix issue with the loss of this
_.bindAll(this);
```

I suspect this code isn't actually accomplishing anything. See the docs for what bindAll does and you'll see that it requires function names to be passed in to actually do anything. http://underscorejs.org/#bindAll