REST API:Replicator deleteFile

Change-Id: I05c90d07293e9291926b4b380ec88f6619b5a613
Reviewed-on: http://naan.mimuw.edu.pl:8001/121
Tested-by: Nebulostore Nebulostore <nebulostore@gmail.com>
Reviewed-by: Lukasz Siczek <siczek.lukasz@gmail.com>