Updated setup.py for new name for widgy on PyPi
Merge pull request #17 from zmetcalf/update_for_pypi_for_widgy

Updated setup.py for new name for widgy on PyPi
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.
Add layout_model attr for BlogAdmin subclasses
Inherit from Layout instead of DefaultLayout