Added optional email cleanup on S3 at end of process#73

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nbcraft wants to merge 2 commits intoarithmetric:masterfrom nbcraft:nbcraft/feature/email-cleanup

+128-7

Commits on Jan 7, 2018

Added optional email cleanup on S3 at end of process
nbcraft
committed

Commits on Jan 8, 2018

emailCleanupOnS3: move config assertion to cleanup method
nbcraft
committed