lcdserial example

Hey, I made a quick and dirty 'merge' of the lcd and serial examples :)

The display responds to any activity on the serial line and then counts up.
Sometimes it's a little buggy when counting too fast, but otherwise it works fine using for instance a 'while true; do echo "" > /dev/ttyUSB0; sleep 1; done'
(running for ~1500 seconds now ;) )

cheers!