Fix issues with postinstall script
Fix issues with postinstall script

Fixes incorrect permissions with additional files and errors with
unloading/loading launchd jobs. The postinstall script will now
correctly unload and (re)load the LaunchDaemon/LaunchAgent.

Future development should consider adding the option to set permissions
for additional files at the command line (like the file locations).

jacobfgrant/mac-admin,jacobfgrant/mac-admin