fix ExtendedImageField for django > 1.0
fix ExtendedImageField for django > 1.0

hsoft/DjangoBB,slav0nic/DjangoBB,hsoft/DjangoBB,saifrahmed/DjangoBB,agepoly/DjangoBB,hsoft/slimbb,agepoly/DjangoBB,rashoodkhan/DjangoBB,saifrahmed/DjangoBB,slav0nic/DjangoBB,hsoft/slimbb,hsoft/DjangoBB,rashoodkhan/DjangoBB,hsoft/slimbb,slav0nic/DjangoBB,saifrahmed/DjangoBB,agepoly/DjangoBB