changes from Percy
Merge pull request #528 from willum070/percy

changes from Percy
fixes logic so participant is included in query
Merge pull request #532 from Tivix/feature/fix-auto-submission-metadata

Fix auto submission metadata
fixes notification sending to denied participants
fixes dataset.pk to be string...
Merge pull request #533 from Tivix/feature/fix-notifications-emailing-all-participants

Fix notifications emailing all participants
merges master