This extension is used for working with the datapusher on CKAN 2.1. CKAN 2.2 will have this functionality built in.
In order to use this the datapusher needs to be installed. See:
https://github.com/ckan/datapusher
To configure add
ckan.datapusher.url = <urlofdatapusher>
to your config where <urlofdatapusher> is the fully qualified url of the service.