Howl spec loop: Step the default loop as well

In order for the default timeouts to work
editor-paste: Cut any selection before pasting

Closes #26.
Prompt before saving if a file is modified on disk

Fixes #25
Remove old focus work-around that meant selection was lost

Was put in place since the cursor was invisible at times upon
startup. We'll see if that shows up again, but it's likely
fixed with the recent Scintilla patch for invisible cursors.

Seems like this should be the cause of #27 since that works fine
for me afterwards.