Added ability to specify site title/description on purge.
Added ability to specify site title/description on purge.

artefactual/atom,Surfrdan/atom,artefactual/atom,artefactual/atom,kyfr59/atom-cg35,kyfr59/atom-cg35,artefactual/binder,CENDARI/atom,kyfr59/atom-cg35,artefactual/binder,Surfrdan/atom,CENDARI/atom,artefactual/binder,Surfrdan/atom,CENDARI/atom,artefactual/binder