Merge pull request #88 from eahrold/master

when building mailcore2, only run for osx architecture with prepare-mac.sh
Merge pull request #89 from eahrold/master

catch situations where nil would cause array index exceptions
Just being nitpicky.
ensure MakeCatalogs.munki is included in recipe_list.txt issue #74
Fix if statement code format
Merge pull request #91 from eahrold/master

ensure MakeCatalogs.munki is included in recipe_list.txt issue #74
get stderr of autopkg run sent to progressPanel.
Merge branch 'master' into progress-indicators