Fix badge image conversion issues
Fix badge image conversion issues

This fixes the problem where if you try to create a badge with a PNG
image that has an alpha channel, django-badger takes that alpha channel
out back and shoots it in the face with fire changing it to charcoal
black.

mozilla/django-badger,donberna/django-badger,Nuevosmedios/django-badger,hackultura/django-badger,Nuevosmedios/django-badger,mozilla/django-badgekit,mozilla/django-badger,donberna/django-badger,hackultura/django-badger