Updated MANIFEST.in and setup.py to include template files
Merge pull request #19 from zmetcalf/setup_templates_fix

Updated MANIFEST.in to include template files
AbstractBlogLayout subclasses override too much

AbstractBlogLayout forced subclasses to override the Queryset
class and the owner property in order to specify different owner
models. Now, subclasses can just override the owner_class.
BlogAdmin subclasses override too much