Platfomio libraries definition update (#694)

Change sha commit separation key for PIO
complete the name of htu21 library,
PIO Add github full path to the libraries def
and add rfm69spi library
and add rfm69 low power

main/ZgatewayRFM69.ino

@@ -34,7 +34,6 @@
 
 #  include <EEPROM.h>
 #  include <RFM69.h> //https://www.github.com/lowpowerlab/rfm69
-#  include <SPI.h>
 
 char RadioConfig[128];