PEP-8 and style changes

If you followed the style I suggested above here, you could make much more efficient use of vertical space:

```
spinner = ThreadedSpinner(
   self, refresh_seconds=.5, in_progress_color=COLOR_IN_PROGRESS, 
   completed_color=COLOR_COMPLETED, spin_tag=TAG_THREADED_SPINNER)
```

Alright, I'll shut up about that now.