Adds breaking test for paths. My assumption is that this example should
work:

```javascript
var model = {
        host: { url: 'example.com' },
        path: { name: 'hello' }
};
```

```htmlbars
<a href="http://{{host.url}}/{{path.name}}/">hello</a>
```
Adds an ability to read paths
Merge pull request #1 from twokul/paths

[WIP]: Adds breaking test for paths