Propagate signing argument to submodules
Add signing information to the debugging message
Fix flake8 warnings
merge master -D org: PR 157 (Milestone command)
merge master -D org: PR 160 (Tag release sign)
merge master -D org

Repository: openmicroscopy/snoopycrimecop
Excluded PRs:
  # PR 159 sbesson 'Tag release prefix' (label: exclude)
Already up-to-date.

Merged PRs:
  # PR 157 sbesson 'Milestone command'
  # PR 160 sbesson 'Tag release sign'

Generated by SCC-merge#294 (http://ci.openmicroscopy.org/job/SCC-merge/294/)