V3.0.2

Add new examples for MIDI serial tests, Add definitions for interfaces as -
#define MIDI_PC_USB 0
#define MIDI_SERIAL 1
#define MIDI_HOST 2
#define MIDI_DEBUG 3

Now, any button object can be bound to any interface.
Have fun!

V3.0.1

1. Add Support for Interface joshnishikawa#3 - Serial Debug
2. Fix Serial MIDI1.begin() omitted bug

Version3

Add Serial MIDI support, fix various crashs/bugs.