Merge pull request #773 from rleigh-dundee/make-props-dev50

make: Convert variables to ant properties
Only show custom login image via url
Add custom login logo doc to Windows install-web
build: Pass through JENKINS_JOB
merge dev_5_0 -D org: PR 774 (Custom web login 11961)
merge dev_5_0 -D org: PR 775 (build: Support JENKINS_JOB)
merge dev_5_0 -D org

Repository: openmicroscopy/ome-documentation
Updating 25ff911..3bf33ea
Merged PRs (fast-forward):
  # PR 773 rleigh-dundee 'make: Convert variables to ant properties'
  # PR 763 rleigh-dundee 'Deprecate Ice 3.3 and note its removal for 5.1'
  # PR 770 hflynn 'Adding pyramid generation data duplication warning to in-place import'
  # PR 765 hflynn 'Making API doc links point at release version'
  # PR 764 hflynn 'Rephrasing CONTRIBUTING re: branch for PRs'
  # PR 767 rleigh-dundee 'ant: Default all properties and handle empty vars in conf.py'
  # PR 762 rleigh-dundee 'Delegate all Makefile targets to ant'
  # PR 757 hflynn 'ticket 10030 fix - contributing file for docs repo'
  # PR 749 hflynn 'Adding API doc links to OMERO docs front page'

Merged PRs:
  # PR 774 will-moore 'Custom web login 11961'
  # PR 775 rleigh-dundee 'build: Support JENKINS_JOB'

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