force query selector to seek within the html-reporter element

Using jasmine-html.js can create conflicts with your page DOM.

For example:

```
var alert = find(".alert");
```

will conflict with Bootstrap 3 alerts, inserting within the first ```.alert``` found the jasmine DOM: "2 specs, 0 failures" etc.

Forcing the querySelector to start seeking nodes within the ```html-reporter``` class will quickly fix the problem, though it is not ideal (ideally a ```jasmine``` prefix would be better to avoid conflicts => either ```.jasmine-html-reporter``` class or as an ID).