Fix/firmware flashing (#212)

* reset speed after exiting from orbit

* added documentation for non-blocking orbit limitations

* Use Python3 print statements. Needed for DexterOS

Firmware/gopigo3_flash_firmware.sh

@@ -9,7 +9,7 @@ FIRMWARE_FILE=$(sudo find "$REPO_PATH"/Firmware/ -maxdepth 1 -name *.bin)
 echo "Updating the GoPiGo3 Firmware with '$FIRMWARE_FILE'."
 
 # check the RPi version
-RPI_VERSION=$(python -c "import auto_detect_rpi; print auto_detect_rpi.getRPIGenerationCode()")
+RPI_VERSION=$(python3 -c "import auto_detect_rpi; print (auto_detect_rpi.getRPIGenerationCode())")
 # set default to RPi 1 interface config file
 INTERFACE_FILE="rpi1.cfg"
 if [ "$RPI_VERSION" == "RPI2" ] || [ "$RPI_VERSION" == "RPI3" ] || [ "$RPI_VERSION" == "RPI3B+" ]; then