Implement reporting

Reporting is "nearly" at the MVP stage.  I envision something like this:

```
<html>
  {{ if suites: }}
    {{ for suite in suites }}
      <div class="suite">
        <span class="status suite-{{ suite.status }}"></span>
      </div>
      
      <ul>
        {{ for test in suites.tests }}
          <li class="test">{{ test.steps }}
      </ul>
       
</html>
```

etc etc
