Fixing ICE_HOME example in unix install
Add postgres check before brew install
Don't set ICE_CONFIG if no file exists
merge develop -D org: PR 626 (Add new Squash tutorial and screenshots)
merge develop -D org: PR 709 (Homebrew install edits)
merge develop -D org

Repository: openmicroscopy/ome-documentation
Updating df2965f..bb55729
Merged PRs (fast-forward):
  # PR 707 hflynn 'Updates to sysadmin installation docs (rebased onto develop)'

Merged PRs:
  # PR 626 pwalczysko 'Add new Squash tutorial and screenshots'
  # PR 709 will-moore 'Homebrew install edits'

Generated by OMERO-5.1-merge-push#122 (http://ci.openmicroscopy.org/job/OMERO-5.1-merge-push/122/)