Delegate all Makefile targets to ant

Embed and use ant-contrib so that it's possible to build on systems
without ant-contrib on the default classpath.
merge develop -D org: PR 758 (Adding API doc links to OMERO docs front page (rebased onto develop))
merge develop -D org: PR 759 (ticket 10030 fix - contributing file for docs repo (rebased onto develop))
merge develop -D org: PR 760 (Make Ice 3.4 the minimum supported version)
merge develop -D org: PR 761 (Delegate all Makefile targets to ant)
merge develop -D org

Repository: openmicroscopy/ome-documentation
Excluded PRs:
  # PR 743 sbesson 'Propose redesign of OMERO and Bio-Formats 5.0 CI jobs' (exclude comment)
Already up-to-date.

Merged PRs:
  # PR 758 hflynn 'Adding API doc links to OMERO docs front page (rebased onto develop)'
  # PR 759 hflynn 'ticket 10030 fix - contributing file for docs repo (rebased onto develop)'
  # PR 760 rleigh-dundee 'Make Ice 3.4 the minimum supported version'
  # PR 761 rleigh-dundee 'Delegate all Makefile targets to ant'

Generated by OMERO-5.1-merge-push#188 (http://ci.openmicroscopy.org/job/OMERO-5.1-merge-push/188/)