Fixed documentation error in the range docs.  Temporarily disabled the opener-caching because it seems to not quite work correctly yet.
Fixed documentation error in the range docs.  Temporarily disabled the
opener-caching because it seems to not quite work correctly yet.

tradej/urlgrabber,Distrotech/urlgrabber,Distrotech/urlgrabber,tradej/urlgrabber,henrysher/urlgrabber,Distrotech/urlgrabber,henrysher/urlgrabber,henrysher/urlgrabber,oe-lite/urlgrabber,henrysher/urlgrabber,Distrotech/urlgrabber,oe-lite/urlgrabber,oe-lite/urlgrabber,tradej/urlgrabber,oe-lite/urlgrabber