Support receiving digital or analog value reporting as 2 7-bit bytes. Fixes gh-25

See: https://github.com/voodootikigod/voodoospark/commit/d4b08898bf6c2b1d8f5c8397da5291ee5f26c080
Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
v0.5.0

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