Create script to build launchd installer pkgs
Create script to build launchd installer pkgs

Having created a launchd LaunchDaemon/LaunchAgent, it is necessary to
install it. This commit adds a script capable of taking a launchd plist
file and building an installer pkg using the munkipkg tool. The plist is
packaged together with an autogenerated postinstall script to load the
job.

Future development is required to allow this script to include
additional files or scripts in the package, and to allow for a
pre-built build-info.plist file (currently this plist is
automatically generated).

jacobfgrant/mac-admin,jacobfgrant/mac-admin