Arduinozyme.ino: change T command to tone(pin,freq) with freq=0 calling noTone() to vacate 't' command.
Arduinozyme.ino: Change 'i' to force pinMode(d,INPUT)
Arduinozyme.ino: Add parsing of a startup string for unattended operation.
Arduinozyme.ino: Add 'r' for reading without modifying pin mode.
Merge pull request #8 from drf5n/master

Arduinozyme.ino: change T command to tone(pin,freq) with freq=0 meaning stop.