Fixed Serial1 references in leo_echo sketch
Fixed Serial1 references in leo_echo sketch

ulrichard/Adafruit-GPS-Library,lolisa/2014-15,huskyroboticsteam/2014-15,tonesandtones/Adafruit-GPS-Library,lolisa/2014-15,1ChicagoDave/Adafruit-GPS-Library,kaaLabs15/Adafruit-GPS-Library,lolisa/2014-15,adafruit/Adafruit-GPS-Library,huskyroboticsteam/2014-15,huskyroboticsteam/2014-15