Store a list of all files in replicator.

Change-Id: I91f12c0d4584af3fc691b526d0260b0f09148a9e
Reviewed-on: http://naan.mimuw.edu.pl:8001/99
Tested-by: Nebulostore Nebulostore <nebulostore@gmail.com>
Reviewed-by: Lukasz Siczek <siczek.lukasz@gmail.com>