Show which suites are still in progress and which are finished

When running multiple suites at once, or even just sequentially, it would be clearer if runners still in progress had some sort of indicator. E.g.

```
0-5  /path/to/specs/settings.spec.js
     0 passed  0 failed  19 pending

0-6  /path/to/specs/billing.spec.js
     0 passed  0 failed  19 pending  (still running)
```

Or maybe an animated ellipsis.