Job to publish and unpublish sites based on a site property

This is a simple job that publish any site with this site property:

publish-date: 2015/05/15

where the date is today's date in the moment the job runs, and is in that format (yyyy/MM/dd).

And it unpublish sites following the same criteria about site properties:

unpublish-date:2015/07/23

If publish and unpublish date is the same, it unpublish it.

If someone find this useful I can try to do a pull request to add this to Sakai 11. Meanwhile here is the patch in the case someone wants to use it.