Correctly handle multiple creators.
Correctly handle multiple creators.

My test book has two <dc:creator> elements:
  <dc:creator>Brendan Gregg</dc:creator>
  <dc:creator>Jim Mauro</dc:creator>

Before it would return
  Brendan GreggJim Mauro

Now it returns
  Brendan Gregg, Jim Mauro

(Probably needs to be localised better.)

jaketmp/ePub-quicklook,jaketmp/ePub-quicklook