Generate relative image paths

Can you replace the absolute images paths generated inside reports for relative ones
so instead of:

``` html
    <img src="file:///C:/.../build/output/documentation/images/failure.png" title="Failed" alt="Failed" />
```

we have

``` html
     <img src="../images/failure.png" title="Failed" alt="Failed" />
```

This way when I zip up the report and email it to someone it will still work.

Thanks,
