ModelForm without 'fields' or the 'exclude' attribute is deprecated

Added exclude = [] to class Meta fro PhotoAdminForm and GalleryAdminForm

DeprecationWarning: Creating a ModelForm without either the 'fields' attribute or the 'exclude' attribute is deprecated - form GalleryAdminForm needs updating

DeprecationWarning: Creating a ModelForm without either the 'fields' attribute or the 'exclude' attribute is deprecated - form PhotoAdminForm needs updating
Merge pull request #82 from jscott1971/patch-1

ModelForm without 'fields' or the 'exclude' attribute is deprecated