for_manish.md

1. Change your schema and templates and so forth to have package_create and package_update store your domain field.
2. In your IDomainObjectNotification, you'll get an object called entity which is a package model from ckan/model/package.py
3. You can find the groups for this package using get_groups()
4. You can add the package to a group by calling add_package_by_name on the group object.
5. If you find the domain property isn't available in package.extras.get('domain') then you may need to use notify_after_commit