3.0 2012-07-12 - Mark Stanley : Modified pin functions to support Keypad_I2C
3.0 2012-07-12 - Stanley & Young : Fix for multiple keypad objects.
3.0 2012-07-12 - Mark Stanley : Fixed bug that caused shorted pins.
2.0 2011-12-29 - Mark Stanley : Added Nick Gammon's changes.
2.0 2011-12-29 - Mark Stanley : Added waitForKey()
2.0 2011-12-23 - Mark Stanley : Rewrote state machine
2.0 2011-12-23 - Mark Stanley : Significant speed improvements.
1.8 2011-11-29 - Tom Putzeys : Enabled internal pull-ups on non-active columns
1.8 2011-11-21 - Mark Stanley : Added test for version 1.0 of the IDE
1.8 2009-07-08 - Alexander Brevig : Added no restrictions on sizes or keymaps
Apparemment ca a du se passer dans la 2.0 quand ils ont ajouté waitForKey() qui n'aurait pas eu de sens autrement