Add client logic to remove SIPs based in Backboney.sync and its RESTful JSON interface (DELETE verb).
Add client logic to remove SIPs based in Backboney.sync and its RESTful JSON interface (DELETE verb).

Autoconverted from SVN (revision:1076)

artefactual/archivematica-history,artefactual/archivematica-history,artefactual/archivematica-history,artefactual/archivematica-history