don't call super

If you only enable `growl-rspec` formatter, you get output like this:

```
No DRb server is running. Running in local process instead ...

Run options: exclude {:capybara=>true}

Finished in 0.02603 seconds
4 examples, 0 failures
>
```

So there are no standard "...." progress dots. If I want to see them too, then I can enable two formatters, which is a feature RSpec supports. But then I get output like this:

```
No DRb server is running. Running in local process instead ...

Run options: exclude {:capybara=>true}
Run options: exclude {:capybara=>true}
....

Finished in 0.11286 seconds
4 examples, 0 failures

Finished in 0.11286 seconds
4 examples, 0 failures
>
```

Because `growl-rspec` is calling the superclass implementations of the base text formatter which prints those summaries second time. If I remove the two `super` calls, then I get what I expect (`growl-rspec` only shows the notification and the other formatter prints the dots and summaries).