Definizione del nome dei connettori per il GroveTopping-R0
First implementation of grove functions to set digital outputs.
Added files to manage Grove Buzzer sensor.
Added toggle function into Buzzer module.
Added implementation to manage digital output connectors on Grove shield for FRDM-KL25.
Added files to manage Grove Relay sensor.
small fix on code documentations.
Improvements of functions to manage digital I/O.
Added files to manage Grove Button sensor.