Update of the Input selector script

I updated the input selector script to include GPIO (retrogame) and MCP module (pikeyd) selection. See https://github.com/ian57/Raspicade-configuration-files/commit/8d03b843f38d36e2379516ff02c789d2a6f183cc#diff-b04cf1e875a950a775567cba87fbebc5

You can update the 20150408 release with these commands :

$ cd temp/Raspicade-configuration-files/
$ git pull
$ sudo cp etc/rc.local* /etc/
$ cp piinputconf.sh ~/
$ sudo reboot