Nogui patch
Using digital input in beagle
Hooked up one digital input and one digital output and tested in BBB.
Updated input external
Added pcb schematic and layout
added readme to pcb
Changed some connections in the board
Added minimal version of PCB
Merge branch 'bbb-io' into master

Conflicts:
	pcb/ModuloPrincipal.fzz
	pd/patches/mikro-synth.gui.pd