Merge pull request #175 from pculture/x-2355

2355: add "needs editing" tag for subtitles that have been sent back
Fixed http callback notification  for DMR
Added a Referer header to http callback notifications so that customers can tell which environment it's coming from
Ported team http callback to DMR
And one more place to migrate DMR on notifications
Updated integration repo
Merge branch 'staging' into dev