Merge pull request #330 from akintolga/master

[SD-1005] Added new attributes to archive
feat(url prefix) - allow URL_PREFIX to be used when running the test
suite

SD-910 failing tests when running them inside docker
fix(display_name) - when updating the user.
Remove obsolete endpoint to show items per stage.
SD-1018
Merge remote-tracking branch 'adrian/prefix-fixes'
[SD-1010] Changed desk schema to add  spike expiry value
Merge branch 'master' of https://github.com/superdesk/superdesk-server