Fix issue where installer would say it cannot install on Mavericks because of Message UUID missing.
Update project to build consistently with the same scripts and also to use git build number.
Merge branch 'hotfix/1.7.3'

* hotfix/1.7.3:
  Update project to build consistently with the same scripts and also to use git build number.
  Fix issue where installer would say it cannot install on Mavericks because of Message UUID missing.