Fix allowing ImageField objects be moved to the permanent folder
Fix allowing ImageField objects be moved to the permanent folder

Without this fix images stored in the ImageField were never moved to the
permanent folder - if i get it right, the ImageField class was just
ommited here by mistake.

alexander-gridnev/django-files-widget,interisti/django-files-widget,dellax/django-files-widget,alexander-gridnev/django-files-widget,interisti/django-files-widget,interisti/django-files-widget,dellax/django-files-widget,dellax/django-files-widget,alexander-gridnev/django-files-widget