[publishing] added keys to pick when publishing an item
[publishing] added keys to pick when publishing an item

"item_encoding" and "encoded_item_id" are needed by backend to produce binary data.

needed for SDNTB-253

fritzSF/superdesk-client-core,mdhaman/superdesk-client-core,gbbr/superdesk-client-core,mscam/superdesk-client-core,mugurrus/superdesk-client-core,darconny/superdesk-client-core,mdhaman/superdesk-client-core,mugurrus/superdesk-client-core,mscam/superdesk-client-core,pavlovicnemanja/superdesk-client-core,lnogues/superdesk-client-core,thnkloud9/superdesk-client-core,marwoodandrew/superdesk-client-core,fritzSF/superdesk-client-core,gbbr/superdesk-client-core,lnogues/superdesk-client-core,superdesk/superdesk-client-core,Aca-jov/superdesk-client-core,Aca-jov/superdesk-client-core,pavlovicnemanja/superdesk-client-core,pavlovicnemanja/superdesk-client-core,jerome-poisson/superdesk-client-core,gbbr/superdesk-client-core,petrjasek/superdesk-client-core,marwoodandrew/superdesk-client-core,petrjasek/superdesk-client-core,thnkloud9/superdesk-client-core,Aca-jov/superdesk-client-core,mdhaman/superdesk-client-core,lnogues/superdesk-client-core,petrjasek/superdesk-client-core,pavlovicnemanja/superdesk-client-core,superdesk/superdesk-client-core,ioanpocol/superdesk-client-core,ioanpocol/superdesk-client-core,pavlovicnemanja/superdesk-client-core,superdesk/superdesk-client-core,jerome-poisson/superdesk-client-core,mscam/superdesk-client-core,darconny/superdesk-client-core,marwoodandrew/superdesk-client-core,darconny/superdesk-client-core,mdhaman/superdesk-client-core,gbbr/superdesk-client-core,mscam/superdesk-client-core,superdesk/superdesk-client-core,jerome-poisson/superdesk-client-core,marwoodandrew/superdesk-client-core,thnkloud9/superdesk-client-core,fritzSF/superdesk-client-core,superdesk/superdesk-client-core,lnogues/superdesk-client-core,ioanpocol/superdesk-client-core,marwoodandrew/superdesk-client-core,petrjasek/superdesk-client-core,jerome-poisson/superdesk-client-core,mdhaman/superdesk-client-core,jerome-poisson/superdesk-client-core,fritzSF/superdesk-client-core,ioanpocol/superdesk-client-core,thnkloud9/superdesk-client-core,petrjasek/superdesk-client-core,ioanpocol/superdesk-client-core,mugurrus/superdesk-client-core,Aca-jov/superdesk-client-core,mugurrus/superdesk-client-core,darconny/superdesk-client-core