Serial.print() have to be: comms->print()

[sigmaeo]

1.) fixed: 3x Serial left instead of 3x comms 2.) make readBin() safe for less received bytes (see issue #38) 3.) fixed some missing unescape() (see issue #39)

[gyssels]

@sigmaeo I will accept PR on gyssels/Arduino-CmdMessenger, and I messaging the other PR submitters so it can become an active branch I engage myself to do a full PR back here if in the future I'll not maintain this anymore.