RetroPie: Overscan and screen setup

I've tried to show how to alter the overscan settings on the Raspberry Pi so the viewable area all fits on the TV screen.

More details are here:
http://blog.petrockblock.com/forums/topic/using-overscan-in-retropie-to-fit-video-to-your-display/

Also here for the config.txt settings
http://elinux.org/RPiconfig#Video

The video modes for EmulationStation are here:
https://github.com/petrockblog/RetroPie-Setup/blob/master/supplementary/runcommand.sh