Raspberry Pi LCD 4x20 I²C python driver

This driver is intended to be used with a 20x4 I²C LCD (arduino compatible) Exemple of these displays : http://hardware-libre.fr/wp-content/uploads/2014/03/02_1.jpg

Please follow installation procedure : http://hardware-libre.fr/2014/03/raspberry-pi-utiliser-un-lcd-4x20/