Piezo support
Make jshint happy
Minor style fixes
Enable Piezo class
Song/Player status
Add basic tests for Piezo class
Allow digital pin numbers to address analog pins. Fixes #267

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
v0.7.6

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
v0.7.7

Piezo!

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