v0.8.0
v0.8.0

- Piezo class redesign
- Led.Matrix, LedControl class redesign

Signed-off-by: Rick Waldron <dd8fdbe95c7f81f312b273ef8860922803e9ef16@gmail.com>

cumbreras/rv,kod3r/johnny-five,kod3r/johnny-five,joelunmsm2003/arduino,AnnaGerber/johnny-five