use hash of the scanpix id when pushing it to amazon (#390)
use hash of the scanpix id when pushing it to amazon (#390)

SDNTB-659
superdesk/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb,superdesk/superdesk-ntb,petrjasek/superdesk-ntb,petrjasek/superdesk-ntb,petrjasek/superdesk-ntb,superdesk/superdesk-ntb