ant: Set SOURCE_BRANCH and OMERO_RELEASE using omero.shortversion
travis: Hardcode version for ant testing
Allow zero-length environment variables
Merge pull request #750 from rleigh-dundee/ant-props

ant: Set SOURCE_BRANCH and OMERO_RELEASE using omero.shortversion
merge develop -D none -I breaking -E exclude

Repository: openmicroscopy/ome-documentation
Excluded PRs:
  # PR 755 rleigh-dundee 'Search.txt: Correct use of unicode quotes' (user: rleigh-dundee)
  # PR 754 sbesson 'Document new integration jobs' (user: sbesson)
  # PR 743 sbesson 'Propose redesign of OMERO and Bio-Formats 5.0 CI jobs' (exclude comment)
  # PR 745 sbesson 'OMERO.matlab improvements (rebased onto develop)' (user: sbesson)
  # PR 752 rleigh-dundee 'ant: Support API doc generation' (user: rleigh-dundee)
Already up-to-date.

Generated by OMERO-5.1-breaking-push#33 (http://ci.openmicroscopy.org/job/OMERO-5.1-breaking-push/33/)