sinc-iMacBrightness.pl

Added the sinc-iMacBrightness.pl which also relies on Original code
from Matt [Danger]'s blog post:
http://mattdanger.net/2008/12/adjust-mac-os-x-display-brightness-from-th
e-terminal/. The script will brighten the screen to full brightness
upon login. It should also work on any Apple Displays fully connected.