Add support for Django 1.9 and replace StringIO with BytesIO
Add support for Django 1.9 and replace StringIO with BytesIO

hsoft/DjangoBB,hsoft/slimbb,slav0nic/DjangoBB,hsoft/slimbb,slav0nic/DjangoBB,slav0nic/DjangoBB,hsoft/slimbb,hsoft/DjangoBB,hsoft/DjangoBB