Fixed TWI slave example; did not service events.
Fixed TWI slave example; did not service events.

mikaelpatel/Cosa,kc9jud/Cosa,jeditekunum/Cosa,dansut/Cosa,mikaelpatel/Cosa,jeditekunum/Cosa,rrobinet/Cosa,rrobinet/Cosa,mikaelpatel/Cosa,kc9jud/Cosa,mikaelpatel/Cosa,rrobinet/Cosa,jeditekunum/Cosa,kc9jud/Cosa,jeditekunum/Cosa,dansut/Cosa,dansut/Cosa,rrobinet/Cosa,kc9jud/Cosa,dansut/Cosa