Added script for system changes PKG

This script will be delivered in a PKG to change system settings on Mac
OS 10.8 and 10.9

switch to using name and password fields on the login window:
Enable Require password to wake this computer from sleep or screen
saver.
No .ds-store files on network shares
Disable Remote Control Reciver
Show hard drive, connected servers on Desktop for all users
Disables GateKeeper allowing software to install from anywhere
Enable the Firewall