sorl-thumbnail url update
sorl-thumbnail url update

As per https://pypi.python.org/pypi/sorl-thumbnail/12.4a1 homepage attribute
ghachey/django-blog-zinnia,Zopieux/django-blog-zinnia,ghachey/django-blog-zinnia,Fantomas42/django-blog-zinnia,ghachey/django-blog-zinnia,Zopieux/django-blog-zinnia,Zopieux/django-blog-zinnia,Fantomas42/django-blog-zinnia,Fantomas42/django-blog-zinnia